Asaoya Yaichi

タグ: Knife Sharpening

  • 刃返り Kaeri | 5 Essential Truths About the Japanese Knife Burr

    刃返り Kaeri | 5 Essential Truths About the Japanese Knife Burr


    Ishizuchi Kanamono Manufactory 

    I still remember one of my earliest experiences with a Japanese knife burr.

    I had only recently started working as a chef, and like every young cook, I was learning how to sharpen my own knives. One day, while sharpening, a tiny piece of metal suddenly came off the edge.

    I looked at it and genuinely thought part of my knife blade had broken away.

    So I went to the head chef and said something like, “Chef, part of the blade just came off. Is this okay?”

    I can still remember his face.

    He looked at me as if he was thinking, What on earth is this guy talking about?

    Looking back now, it makes me laugh.

    The blade had not fallen off at all.

    What I had seen was a Japanese knife burr coming away from the edge.

    After more than 25 years working as a chef in Japan and Australia, I have sharpened countless knives since then. But recently I realised something: although I had learned to recognise a burr through experience, I had never really stopped to investigate what it actually is.

    So, once again, I decided to look into it.

    What Is a Japanese Knife Burr?

    Asaoya Yaichi

    When sharpening a knife on a whetstone, we are removing a very small amount of steel from the blade. As the abrasive surface of the stone works against the steel, the geometry of the edge gradually changes until the sharpening reaches the very apex.

    At that point, extremely thin metal at the edge can be pushed over to the opposite side. This thin, folded-over material is what we commonly call a burr.

    In Japanese sharpening, it is often referred to as kaeri (返り), or ha-gaeri (刃返り).

    That tiny piece of metal I saw as a young chef was therefore not my knife mysteriously losing its cutting edge. It was material created during the sharpening process.

    If somebody had explained that to me at the time, I probably would not have asked my head chef whether my blade had fallen off.

    But making mistakes is often how we remember things.

    👉 INTERNAL LINK: Read “Whetstone Flattening” here

    Why Does a Japanese Knife Burr Appear?

    A Japanese knife burr can be useful because it gives us information about what is happening at the edge.

    If you sharpen one side and eventually detect a burr along the opposite side, it generally indicates that your sharpening has reached the apex in that area.

    But there is an important distinction.

    Creating a huge burr is not the goal of sharpening.

    When I was younger, I sometimes thought that if I could clearly feel a large burr, I must have sharpened the knife properly. With experience, I learned that continuing to grind away steel simply to make a larger burr is unnecessary.

    You are removing steel every time you sharpen.

    The purpose is to create a clean, properly formed cutting edge—not to remove as much metal as possible.

    👉 INTERNAL LINK: Read “How to Sharpen Japanese Knives” here

    A Bigger Japanese Knife Burr Is Not Necessarily Better

    sharpening Japanese Knife

    This is where sharpening becomes more interesting.

    A large Japanese knife burr may actually be a sign that you have continued sharpening longer than necessary. Once the abrasive has reached the apex and a burr has formed, repeatedly grinding the same side can simply produce more deformation and remove more steel.

    This connects with something I have learned through my own mistakes.

    If you keep sharpening at too high an angle, the geometry around the cutting edge can gradually become thicker. Similarly, using a whetstone that is no longer flat can affect the geometry you are trying to create.

    Sharpening is not only about making a knife feel sharp today. It is also about maintaining the blade over many years.

    👉 INTERNAL LINK: Read “Japanese Knife Bevels | Single vs Double” here

    Removing the Japanese Knife Burr Matters Too

    Forming the burr is only part of the process.

    Eventually, that weakened metal needs to be removed cleanly.

    Simply leaving a large burr attached can create the impression of an extremely sharp knife at first, but that fragile metal may fold, break away or disappear quickly during use.

    This is one reason the finishing stages of sharpening matter.

    I normally use a 1000-grit stone for my main sharpening and then move to a 6000-grit stone for finishing. The lighter work at the end is not about aggressively removing more steel. I am refining the edge and reducing what remains of the burr.

    The more knives I sharpen, the more I feel that the final light touches are just as important as the earlier grinding.

    👉 INTERNAL LINK: Read “The True Value of Japanese Knives” here

    Japanese Knife Burrs Taught Me Something About Sharpening

    Kurouchi

    There is another lesson hidden in that embarrassing story from when I first became a chef.

    Nobody starts out knowing how to sharpen.

    You can read about angles, steels, whetstones and edge geometry, but eventually you have to put a knife on a stone and learn what is happening through your hands.

    Over the years I have used carbon steels, stainless steels and modern high-performance steels, and they do not always feel exactly the same on a whetstone.

    That tactile experience is one of the things I still find fascinating about Japanese knives.

    👉 INTERNAL LINK: Read “Kireaji — What Does Sharpness Really Feel Like?” here

    The Japanese Knife Burr Is a Sign, Not the Goal

    More than 25 years after telling my head chef that “the blade came off,” I can finally give my younger self a better answer.

    Don’t worry.

    The blade didn’t fall off.

    It was just the burr.

    A Japanese knife burr is useful because it can tell us that sharpening has reached the edge, but producing the biggest possible burr does not mean producing the best possible edge.

    For me, that is the real conclusion.

    The burr is a sign during sharpening. It is not the goal of sharpening.

    And perhaps that is why I still remember that confused look on my head chef’s face all these years later.

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  • 真価 Shinka | 7 Powerful Truths About a New Japanese Knife’s Real Potential

    真価 Shinka | 7 Powerful Truths About a New Japanese Knife’s Real Potential


    240mm Sujihiki VG10 Hammered 17 Layer Damascus Mahogany

    When you buy a new Japanese knife, it is natural to assume that the sharpness you feel straight out of the box represents the very best that knife can offer.

    I used to think the same way.

    After more than 25 years working as a professional chef in Japan and Australia, I have handled many different Japanese knives. Yet one thing I have learned through actually using and sharpening them is surprisingly simple: a new Japanese knife does not always reveal its full potential on the first cut.

    Sometimes I have picked up a brand-new knife and felt a slight roughness at the edge. It was certainly sharp, but something about the cutting feel made me wonder whether there was more hidden inside the blade.

    Then I sharpened it myself.

    And it cut better.

    That experience changed the way I judge a new knife. Today, I do not necessarily see factory sharpness as the final destination. To me, it is simply the starting point.

    1. A New Japanese Knife Is the Beginning, Not the Finish

    Ishizuchi Kanamono Manufactory

    For a long time, I assumed something very straightforward: if a knife is brand new, surely this must be the sharpest it will ever be.

    It sounds logical.

    But after sharpening some of my own knives, I realised that this was not always true.

    A quality Japanese knife may already have excellent steel, geometry and craftsmanship, but the feeling at the edge can still change depending on how it is sharpened and maintained.

    This is one reason I believe it is difficult to judge the true character of a knife from its first few cuts alone.

    👉 INTERNAL LINK: Japanese Knife Bevels | Single Bevel vs Double Bevel Explained

    2. The First Cut Does Not Always Reveal Everything

    Sharpness is not only about whether a knife can cut through something.

    As a chef, I notice how the edge enters the ingredient, how much resistance I feel and how smoothly the blade continues through the cut.

    Occasionally, with a new Japanese knife, I have noticed a slightly rough feeling at the edge. This does not automatically mean that the knife is bad or that there is something wrong with the steel.

    It simply tells me that I have not yet discovered everything that knife can do.

    This is also why I have always believed that Kireaji — the feeling of sharpness — is something you experience through your hands, not simply something that can be understood from specifications.

    👉 INTERNAL LINK: 切味 Kireaji | 7 Truths About What Sharp Really Feels Like

    3. Sharpening My New Japanese Knife Changed My Perspective

    The biggest lesson came when I sharpened a knife myself and realised that I could make it cut better than it did when it was new.

    That was an important moment for me.

    Until then, part of me had assumed that the manufacturer had already created the ultimate edge. If this was how it cut when new, then perhaps this was simply the maximum performance of that particular knife.

    But after sharpening it, the cutting feel improved.

    The knife had not changed.

    The steel had not changed.

    What changed was the edge.

    That made me realise that the sharpness of a new Japanese knife should not automatically be treated as a measurement of everything the knife is capable of.

    👉 INTERNAL LINK: Whetstone Flattening — Why a Flat Whetstone Matters

    4. The Steel Has Potential — The Edge Helps Reveal It


    180mm Santoku SG2 Rosewood Octagonal Hand

    This is where the Japanese word 真価 — Shinka feels appropriate to me.

    Shinka means something close to a thing’s true value or real worth. In this case, I think of it as discovering what a knife is genuinely capable of.

    I do not sharpen a knife simply because I want to say, “Now it is sharper.”

    For me, there is something more interesting about the process.

    A well-made knife already has potential inside it. Through sharpening, use and maintenance, I can gradually discover that potential for myself.

    Perhaps a slightly romantic way of saying it is this:

    A good knife already has the potential. Sharpening is how I help bring it out.

    That is how I have come to think about my own knives.

    5. Hardness Alone Cannot Tell Me How a Knife Will Feel

    Asaoya Yaichi

    When choosing a Japanese knife, it is easy to focus on specifications such as steel type and HRC hardness.

    Those things certainly matter.

    But a number on a product description cannot completely tell me how a knife will feel on the cutting board.

    I want to use it. I want to sharpen it. I want to understand how the edge responds and how the knife behaves during actual kitchen work.

    After years of working with knives, I have learned that specifications can tell me about a knife, but my hands ultimately tell me how I feel about it.

    👉 INTERNAL LINK: Hardness 硬度 | 7 Powerful Truths About Japanese Knife HRC

    6. Sharpening Also Makes a Knife More Personal

    There is another reason I enjoy sharpening my own knives.

    Over time, the knife becomes more familiar.

    You begin to understand how the steel responds to the stone, how easily the edge comes back and what kind of finish feels right for the work you do.

    For me, sharpening is therefore not simply maintenance.

    It is part of developing a relationship with the tool.

    This is especially important with handcrafted Japanese knives because I do not think of them as disposable kitchen products. A good knife can remain part of your kitchen for many years when it is properly used, sharpened and cared for.

    👉 INTERNAL LINK: The True Value of Japanese Knives | 7 Reasons

    7. Don’t Judge a New Japanese Knife Too Quickly


    180mm Santoku VG10 Polished Hammered 67 Layer Damascus Green Handle

    If there is one thing I would tell someone buying a new Japanese knife, it is this:

    Do not assume the first cut tells you everything.

    Of course, a new knife should cut well. But I would not immediately conclude that its factory edge represents the absolute limit of what the blade can achieve.

    Use it.

    Learn how it feels.

    And when the time comes, sharpen it properly.

    You may discover another level of performance that was already waiting inside the knife.

    That, to me, is 真価 — Shinka.

    After more than 25 years as a chef, I still enjoy discovering what a knife can really do. Sometimes the most satisfying moment is not taking a new knife out of the box.

    It is the moment after sharpening it, making that first cut again, and thinking:

    “Yes. This knife had more to give.”

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    https://blog.asaoyayaichi.com.au

    👉 Visit our online store:
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    Thank you for reading, and I hope to see you again in the next story.

  • 愛着 Aichaku | 7 Powerful Ways a Japanese Knife Becomes Truly Yours

    愛着 Aichaku | 7 Powerful Ways a Japanese Knife Becomes Truly Yours

    Ishizuchi Kanamono Manufactory

    A Japanese knife can become much more than just a tool.

    After more than 25 years working as a professional chef in Japan and Australia, I have used many knives. Some have been sharpened countless times. Some have developed scratches, sharpening marks, patina, and other signs of daily work.

    Over time, those imperfections can become part of what makes a knife feel personal.

    But recently, a chef I work with reminded me that there is another way to love a knife.

    He had bought a new knife and was genuinely disappointed when he noticed a small scratch on the blade. The scratch had absolutely no effect on its performance, but that wasn’t the point.

    He wanted to keep his knife beautiful.

    It made me think that perhaps there are two very different ways to develop Japanese Knife Attachment.

    One is to let a knife change through years of use.

    The other is to protect its beauty for as long as possible.

    And I think both are completely valid.

    1. Japanese Knife Attachment Can Grow Through Use

    For many professional chefs, a knife becomes personal simply by using it.

    You sharpen it. You learn its balance. You understand how much pressure it needs and how the blade reacts to different ingredients.

    Eventually, you pick it up without even thinking.

    Small scratches appear. The polish changes. Carbon steel may develop a patina. The handle slowly begins to show signs of years of work.

    For some knives, I actually enjoy watching this happen.

    Those marks aren’t necessarily damage. They can be evidence that the knife has spent years doing exactly what it was made to do.

    A working knife doesn’t always need to look new.

    👉 INTERNAL LINK: Ancient Patina 古色 | 7 Powerful Truths About Japanese Knife Patina That Even Surprised Me

    Sometimes it looks better because it doesn’t.

    2. A Small Scratch Can Mean Something Completely Different

    His Knive

    The chef I mentioned earlier showed me the opposite perspective.

    His knife still performed exactly the same after the scratch appeared, but emotionally, something had changed.

    He had bought something he considered beautiful, and he wanted to preserve that beauty.

    I understand that.

    Japanese knives aren’t only cutting tools. They can represent craftsmanship, tradition, design, and personal taste.

    A polished blade, unusual handle, Damascus pattern, kurouchi finish, or beautiful forging can be the reason someone falls in love with a particular knife.

    Telling that person, “It’s just a tool,” misses the point.

    There are knives we want to use hard.

    And there are knives we want to protect.

    3. Patina and Scratches Aren’t the Only Way to Build Character

    Patina and Scratches

    There is a romantic idea that a Japanese knife should become scratched, sharpened, and covered with the signs of years of use.

    I like that kind of knife.

    But it doesn’t mean every knife needs to age that way.

    A carbon steel knife that develops a beautiful patina can be wonderful. A knife that remains incredibly clean and polished after years of careful ownership can also be beautiful.

    Both require attention.

    One owner may enjoy watching the steel slowly change.

    Another may carefully polish and maintain the blade to prevent unnecessary scratches.

    The results may look completely different, but both owners are building a relationship with their knives.

    That, to me, is part of Japanese Knife Attachment.

    4. Your Hand Learns the Knife Too

    Appearance is only one part of the relationship.

    After using the same knife repeatedly, you begin to understand things that specifications alone can’t explain.

    You know how the handle sits in your hand. You understand its balance point. You know how the blade moves through fish, meat, and vegetables.

    👉 INTERNAL LINK: Japanese Knife Handles | 7 Powerful Reasons the Right Handle Matters

    You may also notice that two knives that appear similar on paper can feel completely different when cutting.

    Steel, hardness, geometry, sharpening, weight, and balance all contribute to that feeling, but the person holding the knife matters too.

    👉 INTERNAL LINK: 切味 Kireaji | 7 Surprising Truths About What Makes a Japanese Knife Feel Sharp

    Eventually, your hand learns the knife almost as much as you learn how to use it.

    That familiarity takes time.

    5. Sharpening Slowly Makes the Knife Your Own

    Sharpening is another important part of this process.

    Every time you sharpen a knife, you make a tiny change to the blade.

    After years of sharpening, a professional chef’s knife may look very different from the same model when it was new.

    Personally, I like that with my working knives.

    The blade carries the history of cooking, sharpening, maintenance, mistakes, corrections, and experience.

    Keeping your sharpening stones flat is also part of maintaining that relationship with your knife.

    👉 INTERNAL LINK: Why Flattening Your Whetstone Matters

    A well-used knife develops a history.

    And that history belongs to the person who used it.

    6. Some Knives Are Tools — Others Are Showpieces


    Ginsan Nashiji Forged Magnolia Octagonal Handle Buffalo Horn

    This distinction has become more interesting to me recently.

    There are knives I want to use without worrying too much about cosmetic changes.

    They are working knives.

    Their purpose is performance. If normal use creates scratches, sharpening marks, or patina, I can accept that.

    But there are other knives that make you stop and look at them.

    Beautiful polishing. An unusual handle. Damascus patterns. Traditional finishes. Exceptional craftsmanship.

    Those knives can create a completely different feeling.

    A handmade Japanese knife can also become more personal because no two handcrafted knives are ever perfectly identical.

    👉 INTERNAL LINK: The True Value of Japanese Knives | 7 Reasons They Are Worth the Investment

    Perhaps that is why some knives eventually become difficult to replace, even when newer or more expensive knives are available.

    7. My Next Japanese Knife May Be an Experiment


    Knife Collection

    If I buy another knife specifically as a showpiece, I want to try something I haven’t really done before.

    I want to see how carefully I can preserve it.

    Not by putting it in a box and never using it.

    I still want to use it.

    But I would pay much more attention to how I clean it, dry it, sharpen it, store it, and protect the blade from unnecessary scratches.

    Instead of allowing time to naturally transform the knife, I would see how much of its original beauty I could preserve.

    In a way, that would still be “raising” the knife.

    Just differently.

    Maybe after five or ten years, it would tell a completely different story from the working knives I have used throughout my career.

    I think both stories would be worth telling.

    There Is No Single Right Way to Love a Japanese Knife

    Two people can own similar Japanese knives and develop completely different relationships with them.

    One may proudly accept the scratches, sharpening marks, patina, and years of professional use.

    Another may carefully protect the polish and feel disappointed by even the smallest scratch.

    Neither is wrong.

    A Japanese knife doesn’t become personal simply because it gets old.

    It becomes personal because of the time, care, work, and attention you give it.

    For some people, beauty comes from allowing a knife to change.

    For others, beauty comes from trying to preserve it.

    Maybe Aichaku — 愛着 is found somewhere between the two.

    And perhaps the most special Japanese knife isn’t always the newest or most expensive one.

    It’s the one you wouldn’t want to replace.

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  • 切味 Kireaji | 7 Surprising Truths About What Makes a Japanese Knife Feel Sharp

    切味 Kireaji | 7 Surprising Truths About What Makes a Japanese Knife Feel Sharp


    180mm Santoku Aogami #2 Green Micarta Handle with Turquoise Spacer

    Japanese knife sharpness is often described as though it were something simple. A knife is either sharp or it is not. It cuts paper cleanly, shaves hair, or slices through a tomato, and we decide that it is sharp.

    But after working as a professional chef for more than 25 years, I have come to feel that sharpness is not quite that simple.

    In Japanese, there is a word that expresses something slightly different: 切味 — Kireaji.

    Kireaji literally relates to the “cutting feel” of a blade. For me, that is a better way to describe what happens when a knife actually meets food.

    Sometimes I sharpen a knife and it seems almost perfect. The blade enters the ingredient effortlessly, as though there is almost no resistance.

    Other times, I sharpen what feels like exactly the same way, using the same stones and technique, yet the knife somehow feels heavier through the cut.

    It is still sharp.

    But it does not feel the same.

    And occasionally, I can even feel a slight roughness through the edge.

    After all these years of using knives professionally, this still fascinates me.

    1. Japanese Knife Sharpness Is More Than “Sharp or Dull”


    Ishizuchi Kanamono Manufactory 

    One of the biggest things I have learned is that Japanese knife sharpness cannot always be explained by a simple sharp-versus-dull measurement.

    A knife may easily cut paper and still feel slightly heavy when slicing food.

    Another knife may not seem dramatically different in a basic sharpness test, yet when it touches fish, meat or vegetables, the blade seems to glide straight through.

    That sensation is difficult to describe until you have experienced it.

    For me, this is where the idea of Kireaji becomes useful.

    It is not simply whether the edge can cut. It is the resistance you feel as the blade enters the ingredient, the way the knife continues through it, and even the feedback transmitted through the handle into your hand.

    👉 INTERNAL LINK: Japanese Knife Bevels | Single Bevel vs Double Bevel Explained

    Understanding the bevel and edge geometry is an important part of understanding why two sharp knives can feel completely different.

    2. Why Japanese Knife Sharpness Can Feel Different After Sharpening

    This is something that still surprises me.

    I can sharpen the same knife on the same stones using what I believe is the same technique, but the final Kireaji is not always identical.

    Sometimes the result is exceptional.

    The knife feels incredibly smooth. There is almost no hesitation when the blade touches the ingredient.

    Then another day, the knife is definitely sharp, but I feel slightly more resistance.

    Why?

    There are many possible explanations. The exact sharpening angle may have changed slightly. The burr may have formed differently. The burr removal may not have been identical. Pressure on the stone may have changed without me consciously noticing it.

    Even the final refinement of the edge can influence the sensation.

    Sharpening by hand contains countless tiny variables.

    That is one reason I think sharpening Japanese knives remains interesting even after many years.

    You can always learn something.

    👉 INTERNAL LINK: Why Flattening Your Whetstone Matters More Than You Think | The Foundation of a Sharp Edge

    3. Japanese Knife Sharpness Can Sometimes Feel Rough

    There is another sensation I occasionally notice after sharpening: a slight roughness.

    The knife cuts.

    It may even cut very well.

    But the edge does not feel completely smooth.

    This is particularly interesting because it demonstrates the difference between simply achieving an edge and achieving an edge that feels right.

    A microscopic burr or differences in edge refinement may contribute to this sensation. The finish produced by the sharpening stone can also influence how the edge interacts with food.

    A highly polished edge and an edge with more microscopic “bite” can both be sharp, but they may not feel identical.

    And depending on what you are cutting, one may actually feel better than the other.

    This is why I do not believe sharpness should always be judged by a single test.

    A kitchen knife exists to cut food.

    Ultimately, food is where I judge it.

    👉 INTERNAL LINK: The True Value of Japanese Knives | 7 Reasons They Are Worth the Investment

    4. A Brand-New Japanese Knife Is Not Always Perfect


    Ginsan Nashiji Forged Magnolia Octagonal Handle Buffalo Horn Series

    This may surprise people buying their first high-quality Japanese knife.

    Brand-new does not necessarily mean the edge will feel perfect to you.

    I have used new knives that felt fantastic immediately.

    I have also taken brand-new knives out of the box and thought:

    “This can be better.”

    That does not necessarily mean there is something wrong with the knife.

    The factory or craftsman has applied an edge, but that edge may not be exactly the edge that suits the person using it.

    Sometimes after sharpening a new knife myself, the character of the knife seems to change.

    Suddenly it feels like my knife.

    The resistance changes. The edge responds differently. The Kireaji becomes closer to what I personally expect from a professional kitchen knife.

    This is another reason I would never judge the full potential of a Japanese knife only by its first few cuts straight out of the box.

    5. Steel Changes Japanese Knife Sharpness and Kireaji

    Carbon Steel vs Stainless Steel: Which Japanese Knife Is Right for You?

    Steel absolutely plays a role.

    Over the years I have used both carbon and stainless steels, and I do not think every steel produces exactly the same cutting sensation.

    Aogami, Ginsan, VG10, SG2 and other steels have different characteristics. Hardness, carbide structure, heat treatment, edge stability and sharpening response can all influence how an edge behaves.

    But there is an important point here.

    Harder does not automatically mean better Kireaji.

    A high HRC number can contribute to edge retention and allow certain steels to support fine edges, but hardness alone cannot describe what the knife will feel like when it passes through a piece of fish.

    That is why I think choosing a knife purely by its steel specification can sometimes be misleading.

    Specifications are important.

    But your hand does not read specifications.

    It feels the knife.

    👉 INTERNAL LINK: Hardness 硬度 | 7 Powerful Truths About Japanese Knife HRC That Surprised Even a Chef

    6. Blade Geometry May Matter More Than We Realise

    Santoku vs Gyuto: Which Japanese Knife Should You Choose? | Asaoya Yaichi

    Two knives made from the same steel can still feel completely different.

    Why?

    Because we are not cutting food with steel specifications.

    We are cutting with a three-dimensional object.

    Blade thickness, edge angle, grind, taper, blade height and the geometry behind the edge all influence how easily a knife passes through food.

    A very sharp edge can enter an ingredient easily, but if the blade geometry creates resistance behind that edge, the entire cutting motion may still feel heavy.

    This is one reason a Gyuto, Santoku and Sujihiki can produce very different sensations even when all three are extremely sharp.

    A Sujihiki moving through sashimi has a different purpose from a Santoku working through vegetables.

    The shape of the knife is part of its Kireaji.

    👉 INTERNAL LINK: 均衡 Kinkō | 7 Powerful Reasons Japanese Knife Balance Matters More Than You Think

    Balance does not create sharpness by itself, but it can strongly influence how that sharpness feels in your hand.

    7. The Best Japanese Knife Sharpness Cannot Be Explained by Numbers Alone

    After more than 25 years working with kitchen knives, perhaps the most interesting thing I have learned is how difficult it is to describe the perfect edge.

    HRC cannot explain everything.

    Steel cannot explain everything.

    Sharpening angle cannot explain everything.

    Even a paper-cutting test cannot explain everything.

    There is a moment when a properly sharpened knife touches an ingredient and simply goes through.

    No hesitation.

    No unnecessary pressure.

    No feeling that you need to force the blade.

    You feel it immediately.

    That sensation is what I think about when I hear the word Kireaji.

    And perhaps this is also why Japanese knives remain so interesting to me after decades in professional kitchens.

    I still do not produce exactly the same edge every single time I sharpen.

    Sometimes I finish sharpening and the knife feels good.

    Sometimes it feels very good.

    And occasionally, everything seems to come together perfectly and the blade simply glides.

    Those moments remind me that sharpening is not just maintenance.

    It is a skill that continues to teach you.

    Japanese Knife Sharpness Is Something You Feel

    We often try to understand Japanese knives through numbers.

    HRC.

    Blade length.

    Sharpening angle.

    Steel type.

    These measurements are useful, but they cannot completely describe the experience of using a knife.

    Japanese knife sharpness is ultimately something you feel through your hand and through the food you are cutting.

    The steel matters.

    The heat treatment matters.

    The sharpening matters.

    The geometry matters.

    The person holding the knife matters too.

    Perhaps that is the real meaning of Kireaji.

    Not simply whether a knife is sharp, but how the knife feels when it cuts.

    And even after more than 25 years of using knives professionally, that small difference still makes me want to pick up a knife, sharpen it again, and see if I can make the next edge just a little better.

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  • Professional Choice | Why I Still Use Carbon Steel for Sashimi After 25 Years

    Professional Choice | Why I Still Use Carbon Steel for Sashimi After 25 Years

    Ishizuchi Kanamono Manufactory

    If you asked me what knife I still reach for after more than 25 years as a professional chef, my answer might surprise you.

    Despite owning and using modern stainless steel knives such as VG10, Ginsan, and SG2, I still find myself reaching for a carbon steel sashimi knife whenever I’m preparing sashimi.

    Does that mean carbon steel is always better?

    Not at all.

    After using both carbon steel and stainless steel knives in busy professional kitchens, I’ve learned that every knife has its place. Choosing the right knife isn’t about following trends—it’s about understanding what works best for the job.

    Why I Still Choose a Carbon Steel Sashimi Knife


    210mm Sujihiki Aogami #2 Kurouchi Magnolia Handle

    When slicing sashimi, I enjoy using my Aogami carbon steel knife.

    The first thing I notice is how effortlessly it moves through the fish. The edge feels incredibly refined, allowing long, smooth slices with very little resistance.

    Some chefs believe carbon steel produces cleaner cuts and may even reduce unwanted fish aroma, particularly when slicing tuna or bonito. Whether that’s caused by the steel itself or simply by its exceptional edge is still open to debate.

    Personally, I don’t choose carbon steel because I believe it performs miracles.

    I choose it because I enjoy the feeling every time I use it.

    ➡ Internal Link: 👉 Beginner’s Guide to Japanese Kitchen Knives

    Stainless Steel Is Better Than Many People Think


    180mm Santoku SG2 Rosewood Octagonal Handl

    Modern stainless steels have improved dramatically.

    A properly sharpened VG10 sujihiki can produce beautiful sashimi with excellent edge retention and outstanding corrosion resistance.

    If my VG10 sujihiki and my carbon steel knife are both sharpened to the same level, I honestly don’t think most customers would notice any difference once the sashimi reaches the plate.

    This is why I always tell people not to become obsessed with steel names.

    The sharpness of the edge is far more important.

    ➡ Internal Link: 👉 Ultimate | The Pinnacle of Stainless Steel – 180mm SG2 Santoku with Rosewood Octagonal Handle

    Why I Use Stainless Steel for Onions and Tomatoes

    Kitchen knife

    My knife choice changes completely when preparing vegetables.

    For onions, tomatoes, citrus fruits, and many everyday ingredients, I usually grab my stainless steel gyuto.

    It’s not because carbon steel cannot cut them.

    It’s because stainless steel lets me work without constantly thinking about maintenance.

    Acidic ingredients can react with carbon steel, so I know I’ll need to clean and dry the knife quickly. During a busy shift, stainless steel simply makes life easier.

    Convenience matters in a professional kitchen.

    ➡ Internal Link: 👉 Why Do Japanese Knives Rust So Easily?

    Sharpness Is More Important Than Steel


    240mm Sujihiki VG10 Hammered 17 Layer Damascus Mahogany

    After more than two decades in professional kitchens, I’ve learned one simple truth.

    A perfectly sharpened VG10 knife is far better than a dull carbon steel knife.

    Many people focus entirely on steel—Aogami, Shirogami, VG10, SG2, or Ginsan.

    But steel only gives a knife its potential.

    Sharpening determines how much of that potential you actually experience.

    Learning how to sharpen properly will improve your cooking far more than changing from one steel to another.

    ➡ Internal Link: 👉 Why Flattening Your Whetstone Matters

    My Advice After 25 Years

    VG10 & Aogami #2

    People often ask me which knife they should buy.

    My answer is always the same.

    If you enjoy traditional Japanese craftsmanship and don’t mind a little extra care, a carbon steel knife is incredibly satisfying to own.

    If you want outstanding performance with less maintenance, high-quality stainless steel is an excellent choice.

    Neither is wrong.

    In my own kitchen, I still use both.

    Carbon steel for sashimi.

    Stainless steel for much of my everyday preparation.

    Not because one is superior, but because each knife suits a different purpose.

    That, in my opinion, is what professional cooking is all about.

    ➡ Internal Link: 👉 The True Value of Japanese Knives | 7 Reasons They Are Worth the Investment

    Final Thoughts

    After more than 25 years as a chef, I’ve stopped asking which steel is “better.”

    Instead, I ask which knife is better for today’s job.

    For me, that often means reaching for a carbon steel knife when preparing sashimi and a stainless steel knife for everyday kitchen work.

    If there’s one lesson I’ve learned throughout my career, it’s this:

    The best knife isn’t determined by its steel alone. It’s determined by how well it’s sharpened, maintained, and matched to the task at hand.

    Whether you choose carbon steel or stainless steel, investing in a quality Japanese knife and learning how to care for it will reward you for years to come.

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  • Why Do Japanese Knives Rust So Easily? (And Why That’s Not a Bad Thing)

    Why Do Japanese Knives Rust So Easily? (And Why That’s Not a Bad Thing)

    Ishizuchi Kanamono Manufactory

    One of the most common questions I hear is:

    “Why does my Japanese knife rust so easily?”

    It’s a fair question. After all, many people expect an expensive knife to stay shiny and rust-free forever.

    But with traditional Japanese knives, rust isn’t a sign of poor quality. In many cases, it’s actually a sign of what makes the knife special.

    Why Carbon Steel Rusts

    Asaoya Yaichi

    Many handcrafted Japanese knives are made from high-carbon steel, such as Aogami (Blue Steel) or Shirogami (White Steel).

    These steels are loved by professional chefs because they offer exceptional sharpness, excellent edge retention, and are easier to sharpen than many stainless steels.

    The trade-off is that carbon steel reacts more easily with moisture and acidic foods, so it can develop rust if left wet.

    My Own Experience

    I learned this the hard way.

    Even after rinsing my knife with water, I once left it sitting for a while after cutting citrus fruit.

    When I came back, small spots of rust had already started to appear.

    It wasn’t because the knife was poorly made.

    It was because the acid from the citrus remained on the blade long enough to react with the carbon steel.

    Since then, I’ve made it a habit to wash my knives, dry them immediately, and never leave them sitting wet.

    Rust Doesn’t Mean a Bad Knife


    180mm Kiritsuke Aogami #2 Kurouchi Walnut Octagonal Handle

    Many of Japan’s finest kitchen knives are made from carbon steel.

    Professional chefs continue to choose them because they value cutting performance over convenience.

    A little extra care is a small price to pay for a knife that delivers incredible sharpness and can last for decades.

    How to Prevent Rust

    Knife Care

    Keeping a carbon steel knife in great condition is simple.

    • Wash it soon after use.
    • Dry it thoroughly with a clean towel.
    • Never leave it soaking in water.
    • Be extra careful after cutting acidic foods such as lemons, limes, or tomatoes.
    Tsubaki Oil
    • If storing the knife for an extended period, apply a thin coat of camellia oil (tsubaki oil), which has traditionally been used in Japan to protect carbon steel from rust. If you don’t have camellia oil, a small amount of food-grade cooking oil can also be used as a temporary alternative.

    What If Rust Already Appears?

    Don’t panic if you notice rust on your knife.

    In many cases, light surface rust can be removed before it causes any serious damage.

    Depending on the severity of the rust, you may be able to remove it by:

    • Sharpening the blade on a whetstone.
    • Gently polishing the affected area with fine-grit sandpaper.
    • Using a rust eraser designed for knives and tools, such as products commonly known in Japan as Sabitoru.

    The most important thing is to deal with rust as soon as you notice it. The longer rust remains on the blade, the more difficult it can become to remove.

    Prevention Is Better Than Restoration


    240mm Thick Deba Aogami #2 Kurouchi Walnut Handle

    One of the best ways to keep a carbon steel knife in excellent condition is to prevent rust from forming in the first place.

    Once rust starts to develop, the affected areas can become more susceptible to rusting again if they are not properly cleaned and protected.

    That’s why it’s best to care for your knife from the day you buy it. Keeping the blade clean and dry from the beginning is the easiest way to maintain both its appearance and its cutting performance for years to come.

    As with most knife care, prevention is always easier than restoration.

    Final Thoughts


    180mm Santoku VG10N 33 Layer Damascus Green Marble Handle Rainbow Spacer Blue

    Carbon steel knives aren’t difficult to own—they’re simply different.

    Once you understand how to care for them, you’ll see why so many professional chefs continue to choose carbon steel over stainless steel.

    However, if you’re not confident that you’ll be able to give a carbon steel knife the care it needs, there’s nothing wrong with choosing a stainless steel knife instead.

    A knife that suits your lifestyle is always a better choice than one that causes unnecessary stress.

    At Asaoya Yaichi, we proudly offer authentic handcrafted Tosa knives made by skilled Japanese craftspeople, including both carbon steel and stainless steel options.

    If you’re looking for an authentic Japanese knife, we’d be happy to help you find the one that’s right for you.

    Explore our collection at:

    https://www.asaoyayaichi.com.au

    From Tosa, Japan, to your kitchen.

  • Why Flattening Your Whetstone Matters More Than You Think

    Why Flattening Your Whetstone Matters More Than You Think

    When I first became a chef, I had no idea that whetstones needed to be flattened.

    For nearly two years, I sharpened my knives on the same stone without ever checking if it was still flat.

    The knives became sharp enough for work, so I assumed everything was fine.

    Then one day, while visiting Japan, I took one of my knives back to the shop where I had bought it.

    The craftsman looked at it and simply said,

    “That’s no good!”

    It was a little embarrassing, but it became one of the most valuable lessons I ever learned about sharpening.

    What Is Whetstone Flattening?

    Whetston

    Every time you sharpen a knife, your whetstone slowly wears down.

    Because the centre is used the most, it gradually becomes lower than the edges.

    Even if you can’t easily see it, that slight hollow can affect how your knife is sharpened.

    Flattening simply restores the whetstone back to a perfectly flat surface.

    Why Is It Important?


    165mm Kiritsuke Thick Deba Aogami #2 Kurouchi Walnut Octagonal Handle

    Japanese knives are designed with precise edge geometry.

    If your whetstone isn’t flat:

    • The edge won’t contact the stone evenly.
    • It’s much harder to keep a consistent sharpening angle.
    • The bevel can become uneven.
    • Sharpening becomes less predictable.

    Sometimes people think they’ve forgotten how to sharpen.

    In reality, the problem may simply be the condition of the whetstone.

    How to Flatten Your Whetstone

    I simply use a standard flattening stone designed for whetstones.

    Before I begin, I draw a light grid across the whetstone using a permanent marker.

    There’s no need to colour the whole surface—just a simple grid is enough.

    Wet both stones and rub them together using even pressure.

    And the house was a rental.

    As the surface becomes flat, the marker lines gradually disappear.

    If some lines remain, those areas are still lower than the rest of the stone.

    Once all the lines disappear evenly, rinse the stone thoroughly and it’s ready to use again.

    It only takes a few minutes, but it makes a huge difference to your sharpening.

    A Funny Story From One of My Former Chefs

    Why Flattening Your Whetstone Matters

    One of the chefs I used to work with had a very different way of flattening his whetstones.

    Instead of using a flattening stone, he rubbed them directly on the smooth concrete in his backyard.

    To be fair…

    It actually worked surprisingly well.

    A smooth concrete surface allows you to apply good pressure and removes the high spots quite effectively.

    The only problem was that it left grey sharpening marks and stains all over the concrete.

    Even now, I sometimes wonder if everything went smoothly when he moved out!

    So yes, it can work in an emergency.

    But unless you’re prepared to explain mysterious grey stains to your wife, partner, or landlord, I probably wouldn’t recommend it.

    If you’re renting, it’s definitely best to avoid using your driveway or patio.

    5 Common Mistakes That Damage Japanese Knives

    If you really prefer this method, a better option would be to buy a smooth concrete paver or a flat tile and use that instead.

    Just make sure it’s genuinely flat. If the surface isn’t flat, your whetstone won’t be either. Also, some tiles are so smooth that they don’t remove material very effectively.

    For consistent results, a proper flattening stone is still the easiest and most reliable solution.

    What I Learned


    210mm Gyuto VG10 Polished Hammered 67 Layer Damascus Green Handleす

    Back then, I thought that as long as my knife became sharp, I was doing everything correctly.

    Now I know that good sharpening doesn’t begin with the knife.

    It begins with a flat whetstone.

    Sometimes the smallest maintenance habits make the biggest difference.

    Looking After Your Japanese Knife

    A quality Japanese knife doesn’t require complicated maintenance.

    Keep it clean, dry it properly, sharpen it when needed, and remember to maintain your whetstone as well.

    With proper care, a handcrafted Tosa knife can last for many years.

    At Asaoya Yaichi, we’re proud to offer authentic handcrafted Tosa knives made by skilled craftsmen in Kochi, Japan.

    Explore our collection at:

    www.asaoyayaichi.com.au

    From Tosa, Japan, to your kitchen.

  • Why Flattening Your Whetstone Matters

    Why Flattening Your Whetstone Matters

    Knife Care

    When a knife does not become as sharp as expected, many people assume the problem is their technique or the knife itself.

    But sometimes, the real problem is the whetstone.

    As a whetstone is used, its surface gradually wears down. Because we often sharpen in the same area, the centre can become hollow. Flattening restores the stone to an even surface so the blade can make consistent contact while sharpening.

    What Happens When the Stone Is Not Flat?

    Sharpening on a hollow whetstone can make it difficult to maintain a consistent angle.

    The blade may still become sharp enough to cut, but the bevel can become uneven. It may also be difficult to raise an even burr along the entire edge, and over time the shape of the blade may be affected.

    This is something I learned through experience.

    A Lesson From My Early Years as a Chef

    When I first became a chef, I used a whetstone that was kept at the restaurant.

    It had not been flattened and was already noticeably hollow. At the time, I did not understand why that mattered.

    My knives became sharp enough to use, so I continued sharpening on that same stone for around two years.

    Later, while visiting Japan, I took one of my knives back to the shop where I had bought it in Kappabashi and asked them to sharpen it.

    The person looked at the knife and said:

    “This is no good.”

    He laughed dismissively, but did not explain what was wrong, why it had happened, or how I could correct it.

    I will not name the shop. However, I never bought another knife from them.

    I accept that my sharpening was not good. But beginners cannot improve when they are only criticised and given no explanation.

    How Often Should You Flatten a Whetstone?

    There is no single rule.

    It depends on how often you sharpen, the hardness of the stone and the amount of pressure you use.

    Some people flatten their stone before every sharpening session. Others check it after sharpening several knives.

    The important thing is to inspect the surface regularly and flatten it before the hollow becomes too deep.

    What That Experience Taught Me


    180mm Santoku VG10 Polished Hammered 67 Layer Damascus Green Handle

    Today, I find myself selling knives.

    At the moment, Asaoya Yaichi does not offer a professional sharpening service, and I do not pretend to be a sharpening specialist.

    However, I do want to treat customers differently from the way I was treated.

    People should not be made to feel embarrassed because they are beginners or because they have made a mistake. I made plenty of mistakes myself, including sharpening on an unflattened whetstone for two years.

    When possible, I want to explain:

    • What has gone wrong
    • Why it matters
    • What can be done next

    Selling a knife should not be the end of the relationship.

    Good information and simple maintenance can help a well-made knife remain part of someone’s kitchen for many years.

    Looking for a Japanese Knife Made to Last?

    Asaoya Yaichi

    At Asaoya Yaichi, we offer handcrafted Tosa knives made by skilled Japanese craftspeople.

    Whether you are buying your first Japanese knife or adding to your collection, proper sharpening and whetstone maintenance will help it perform at its best.

    Explore our collection of authentic handcrafted Tosa knives.

    From Tosa, Japan, to your kitchen.

    https://www.asaoyayaichi.com.au

  • 5 Common Mistakes That Damage Japanese Knives

    5 Common Mistakes That Damage Japanese Knives

    Lessons I’ve Learned After More Than 25 Years as a Chef


    180mm Santoku Aogami #2 Green Micarta Handle with Turquoise Spacer

    Japanese knives are often described as delicate or difficult to maintain.

    From my experience, that’s not true.

    After more than 25 years working as a chef in both Japan and Australia, I’ve found that most damage doesn’t happen while you’re cooking—it happens afterwards.

    Rust, cracked handles, warped blades, and unnecessary repairs are often the result of a few simple habits that are easy to avoid.

    Here are the five most common mistakes I’ve seen over the years, including a few I’ve learned from my own experience.

    1. Leaving the Knife Wet After Use

    If I had to choose the biggest cause of rust, this would be it.

    After cooking, it’s easy to leave a knife on the cutting board or beside the sink while cleaning up.

    Unfortunately, even a short period of moisture combined with food residue can start the rusting process.

    Carbon steel is especially vulnerable, but stainless steel isn’t completely immune either.

    A simple routine makes all the difference:

    • Wash the knife soon after use.
    • Dry it thoroughly.
    • Store it somewhere dry.

    Those extra 30 seconds can add years to your knife’s life.

    2. Only Rinsing the Knife After Cutting Citrus Fruits

    Most people know that citrus fruits such as lemons and limes can affect a knife because of their acidity.

    What I’ve personally experienced, however, is that simply rinsing the blade with water isn’t always enough.

    I have rusted a knife myself after cutting citrus and only washing it with water.

    Acid and juice can remain on the blade, especially near the edge, the heel, or where the blade meets the handle.

    After cutting citrus, I always recommend:

    • Wash the knife properly with mild dishwashing liquid.
    • Rinse with clean water.
    • Dry it immediately and completely.

    It’s a small habit that can prevent unnecessary rust.

    3. Ignoring Small Rust Spots

    Small rust spots are much easier to deal with than deep rust.

    Once rust starts penetrating into the steel, removing it becomes much more difficult and time-consuming.

    I’ve learned that preventing rust is always easier than restoring a damaged blade.

    If you notice rust beginning to form, don’t leave it for another day.

    Deal with it early.

    Your knife will thank you for it.

    4. Washing the Knife with Very Hot Water

    Many people know not to use a dishwasher.

    What isn’t discussed as often is washing a knife by hand with very hot water.

    In my experience, repeatedly exposing a knife to very hot water can shorten its lifespan.

    The blade can be placed under unnecessary stress from repeated temperature changes, while the wooden handle suffers even more.

    Over time, excessive heat can cause the handle to:

    • Dry out
    • Expand and contract repeatedly
    • Develop small cracks
    • Split
    • Loosen around the tang
    • Eventually begin to rot from moisture entering through damaged areas

    Once a wooden handle starts cracking, water and food residue can work their way inside, making it more difficult to keep clean and shortening the life of the handle.

    Warm water is all you need.

    Wash the knife quickly, dry both the blade and the handle immediately, and avoid soaking it.

    5. Putting the Knife in the Dishwasher

    This is probably the most well-known mistake, but it’s still worth mentioning.

    Dishwashers expose knives to:

    • High temperatures
    • Strong detergents
    • Long periods of moisture
    • Contact with other utensils

    These conditions can damage both the blade and the wooden handle.

    Even if no damage is visible after one cycle, repeated dishwasher use can significantly shorten the knife’s lifespan.

    A handcrafted Japanese knife deserves to be washed by hand.

    Fortunately, that only takes a minute.

    Japanese Knives Aren’t Difficult to Maintain

    One of the biggest misconceptions is that Japanese knives require complicated maintenance.

    In reality, they don’t.

    Simply remember to:

    • Wash the knife soon after use.
    • Don’t leave it wet.
    • Properly wash it after cutting citrus fruits.
    • Remove rust before it becomes serious.
    • Avoid very hot water.
    • Never use a dishwasher.
    • Dry both the blade and the wooden handle thoroughly.

    None of these steps are difficult.

    They simply become good habits.

    Final Thoughts

    After more than 25 years in professional kitchens, I’ve learned that good knife care isn’t about doing something special.

    It’s about avoiding a few simple mistakes.

    The difference between a knife that lasts five years and one that lasts several decades often comes down to daily habits.

    I still own a knife that has been in my family for over 40 years.

    The reason it’s still in use today isn’t because it received special treatment.

    It’s because someone took the time to wash it, dry it, and care for it properly after every use.

    If you do the same, a quality Japanese knife can reward you with many years of reliable service.

    Looking for a Knife Built to Last?

    Asaoya Yaichi

    The handcrafted Tosa knives available from Asaoya Yaichi are made by skilled Japanese craftspeople and designed for real daily use.

    With proper care, they can remain reliable kitchen tools for many years.

    Explore our collection of authentic handcrafted Tosa knives and find a knife that suits your cooking style.

    From Tosa, Japan, to your kitchen.

    Ready to find the right knife for your kitchen?

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  • How Often Should You Really Sharpen a Japanese Knife?

    How Often Should You Really Sharpen a Japanese Knife?

    A Chef’s Honest Perspective


    I use an electric sharpener at home.

    One of the most common questions I hear is:

    “How often should I sharpen my Japanese knife?”

    The answer might surprise you.

    After more than 25 years working as a chef in both Japan and Australia, I’ve learned that there isn’t a single correct answer.

    Every chef develops their own routine based on the knives they use, the ingredients they prepare, and the standards they set for themselves.

    My Routine May Surprise You


    240mm Thick Deba Aogami #2 Kurouchi Walnut Handle

    To be completely honest, I don’t fully sharpen my knives every day.

    In my own routine, I usually do a proper sharpening on a 1000-grit whetstone about once a week.

    During service, if I feel the edge beginning to lose its bite, I’ll often touch it up lightly on a 6000-grit finishing stone to keep the knife performing consistently until my next full sharpening.

    That approach has worked well for me throughout many years in professional kitchens.

    Every Chef Is Different


    A Chef’s Daily-Cared-For Knife

    At the same time, I’ve worked alongside chefs whose approach is completely different.

    Some sharpen their knives every single day.

    Some go even further, polishing their blades with mirror-polishing compounds until they achieve an incredibly refined finish.

    When you use one of those knives, the difference can be astonishing.

    I’ve borrowed colleagues’ knives before and genuinely thought,

    “Wow… this thing is unbelievably sharp.”

    Those moments remind me that there is always something new to learn.

    I’m Still Learning Too

    People sometimes assume that because I’ve been a chef for over 25 years, I must be a master sharpener.

    The truth is, I don’t see myself that way.

    There are many chefs whose sharpening skills are better than mine, and I’m perfectly happy to admit that.

    Sharpening is a craft in itself.

    Like cooking, it’s something you can continue improving for a lifetime.

    I believe being honest about that is more valuable than pretending to know everything.

    The Goal Isn’t Perfection

    Otori,Scallop,Scampi Sashimi

    For professional chefs, the goal isn’t always creating the sharpest knife imaginable.

    The real goal is having a knife that performs reliably, safely, and consistently throughout service.

    For home cooks, the standard is even simpler.

    You don’t need to sharpen your knife every week just because a professional chef does.

    If your knife still cuts cleanly and feels comfortable to use, it’s probably doing exactly what you need.

    Listen to Your Knife

    Instead of following someone else’s schedule, learn to pay attention to your knife.

    Is it crushing tomatoes instead of slicing them?

    Does it slip instead of biting into ingredients?

    Does it require more pressure than it used to?

    Those are much better indicators than the calendar.

    Every knife tells you when it’s time.

    You simply have to learn how to listen.

    A Final Thought


    When I’m not in the kitchen, I’m probably squid fishing.

    One lesson I’ve learned throughout my career is that there is no single “correct” way to care for a Japanese knife.

    Different chefs have different routines.

    Different kitchens have different demands.

    What matters most is finding a routine that keeps your knife performing well and encourages you to enjoy using it.

    A well-maintained Japanese knife isn’t about chasing perfection.

    It’s about building a relationship with a tool that can serve you for many years.

    Looking for a Japanese knife worth caring for?

    At Asaoya Yaichi, we carefully select authentic handcrafted Tosa knives made by skilled Japanese blacksmiths.

    Whether you’re buying your first Japanese knife or adding to an existing collection, our goal is to help you find a knife you’ll enjoy using—and maintaining—for years to come.

    Explore our collection here:

    https://www.asaoyayaichi.com.au

  • Carbon Steel vs Stainless Steel: Which Japanese Knife Is Right for You?

    Carbon Steel vs Stainless Steel: Which Japanese Knife Is Right for You?

    Introduction

    Carbon Steel vs Stainless Steel is one of the biggest decisions when choosing a Japanese knife.

    If you’ve started looking for a Japanese knife, you’ve probably come across one of the most common questions:

    Should I choose carbon steel or stainless steel?

    It’s a question I get asked regularly, and the truth is simple:

    There isn’t one “best” choice.

    Both carbon steel and stainless steel have their own strengths, and the right knife depends on your cooking style, how much maintenance you’re happy to do, and what you expect from your knife.

    After working as a chef in Japan and Australia for more than 25 years, I’ve used both throughout my career. Rather than believing one is better than the other, I’ve learned that each has its place in the kitchen.

    Carbon Steel Knives


    180mm Santoku Aogami #2 Green Micarta Handle with Turquoise Spacer

    For generations, carbon steel has been the preferred choice of many professional chefs and traditional Japanese blacksmiths.

    Why?

    Because few materials can match its cutting performance.

    Carbon steel takes an incredibly sharp edge, is easy to sharpen, and provides a cutting feel that many chefs simply love.

    Advantages of Carbon Steel

    • Exceptional sharpness
    • Excellent edge retention
    • Easy to sharpen
    • Traditional choice among professional chefs
    • Ideal for mirror polishing and traditional Japanese finishes

    Things to Consider

    Carbon steel does require care.

    If left wet after use, it can rust. Drying the blade immediately and performing occasional maintenance are simply part of owning a carbon steel knife.

    Many chefs don’t see this as a disadvantage—they see it as part of the relationship between the knife and its owner.

    Stainless Steel Knives


    180mm Santoku SG2 Rosewood Octagonal Handle

    Modern stainless steels have come a long way.

    Premium steels such as VG10, Ginsan (Silver 3), and SG2 deliver outstanding performance while requiring much less maintenance than carbon steel.

    For many home cooks, stainless steel offers the perfect balance between sharpness, durability, and convenience.

    Advantages of Stainless Steel

    • Highly resistant to rust
    • Easy to maintain
    • Perfect for everyday cooking
    • Ideal for beginners
    • Available in many premium Japanese steels

    Things to Consider

    Although today’s stainless steels perform exceptionally well, many chefs still prefer the sharpening characteristics and cutting feel of traditional carbon steel.

    Mirror Polish – One of Carbon Steel’s Hidden Beauties

    Another reason many knife enthusiasts love carbon steel is how beautifully it can be polished.

    Carbon steel responds extremely well to polishing, making it easier to achieve a deep mirror finish.

    Traditional Japanese finishes, including mirror polish and kasumi finishes, are often created on carbon steel blades because of the way the steel responds during polishing.

    Stainless steel can certainly be polished to a mirror finish too—especially premium steels like VG10 and SG2—but because these steels are harder and more wear resistant, achieving the same finish usually takes more time and effort.

    If you appreciate beautiful handcrafted knives, carbon steel offers something truly special.

    Another Unique Beauty of Carbon Steel – The Traditional Kurouchi Finish


    210mm Sujihiki Aogami #2 Kurouchi Magnolia はHandle

    Another unique beauty of carbon steel knives is the kurouchi finish, a traditional feature commonly found on handcrafted Tosa knives.

    Kurouchi refers to the dark, rustic surface left on the blade during the forging process. Rather than polishing it away, the black oxide layer is intentionally preserved, giving each knife a distinctive handcrafted appearance and a character that reflects traditional Japanese craftsmanship.

    Beyond its unique appearance, the kurouchi finish also offers a practical benefit. The black oxide layer can provide some protection against rust on the upper part of the blade compared with a fully polished carbon steel blade.

    However, it’s important to remember that a kurouchi knife is still a carbon steel knife. The exposed cutting edge and any polished areas can still rust if left wet, so proper care and drying after use are still essential.

    For many knife enthusiasts, this combination is part of the appeal—a blade that offers exceptional cutting performance, traditional beauty, and practical functionality all in one.

    One of the reasons I personally enjoy kurouchi knives is that they develop their own character over time. Every scratch, every sharpening session, and every meal prepared tells part of the knife’s story, making it feel even more personal with years of use.

    My Personal Perspective After More Than 25 Years as a Chef

    People are sometimes surprised by my answer when they ask which steel I prefer.

    To be honest, I’m not particularly good at keeping up with knife maintenance.

    Because of that, I often reach for stainless steel knives during preparation work.

    When I’m busy with prep, practicality matters. Stainless steel is reliable, easy to maintain, and lets me focus on cooking rather than worrying about wiping the blade every few minutes.

    But my choice changes when I’m working in front of guests.

    When I’m behind the counter, preparing food where customers can watch every movement, sharpness becomes even more important—but so does presentation.

    On those occasions, I often choose a high-quality carbon steel knife that I’ve polished to a mirror finish.

    The incredibly sharp edge, the elegant appearance, and the craftsmanship of a beautifully polished blade all become part of the dining experience.

    To me, using a handcrafted carbon steel knife in front of guests isn’t simply about performance.

    It’s a way of showing respect—for the ingredients, for traditional Japanese craftsmanship, and for the people I’m cooking for.

    That’s why I don’t believe carbon steel is better than stainless steel, or vice versa.

    I simply believe in using the right knife for the right situation.

    Which One Should You Choose?

    Choose Carbon Steel if you:

    • Love exceptional sharpness
    • Enjoy sharpening your own knives
    • Appreciate traditional Japanese craftsmanship
    • Don’t mind spending a little extra time on maintenance
    • Want a blade that develops character over time

    Choose Stainless Steel if you:

    • Prefer low-maintenance cooking
    • Want excellent rust resistance
    • Are buying your first Japanese knife
    • Need a dependable knife for everyday use
    • Want outstanding performance with minimal upkeep

    Final Thoughts

    The best Japanese knife isn’t necessarily the most expensive one or the one made from the hardest steel.

    It’s the knife that suits your cooking style, your experience, and the way you enjoy preparing food.

    At Asaoya Yaichi, we carefully source authentic handcrafted Japanese knives directly from Tosa, Japan, working with skilled blacksmiths and trusted manufacturers who continue generations of traditional craftsmanship.

    Whether you’re looking for a beautifully handcrafted carbon steel knife or a premium stainless steel blade, our goal is simple:

    To help you find a knife you’ll genuinely enjoy using for many years to come.

    Explore Our Collection

    If you’re interested in authentic Japanese knives forged in Tosa, we’d love to help you find the perfect one.

    Browse our collection:

    👉 https://www.asaoyayaichi.com.au

    You may also enjoy these guides:

    Each article is written from my own experience as a chef with more than 25 years of working in professional kitchens across Japan and Australia.

    Thank you for reading, and I hope this guide helps you choose the Japanese knife that’s right for you.

    Bringing Authenticity to You.

  • How to Care for Your Japanese Knife | Keep It Sharp for Years

    How to Care for Your Japanese Knife | Keep It Sharp for Years

    Buying a quality Japanese knife is just the beginning.

    With proper care, a handcrafted knife can provide exceptional performance for many years—often decades. Unfortunately, many knives lose their edge prematurely, not because they’re poor quality, but because they’re cared for incorrectly.

    After more than 25 years working as a chef in Japan and Australia, I’ve seen many excellent knives damaged by simple mistakes that are easy to avoid.

    1. Wash Your Knife by Hand

    Always wash your knife by hand using warm water and a mild detergent.

    Never leave it soaking in the sink, and avoid putting it in the dishwasher. The high heat, harsh detergents, and contact with other utensils can damage both the blade and the handle.

    After washing, dry the knife immediately with a soft towel.

    2. Use the Right Cutting Board

    A quality knife deserves a quality cutting surface.

    Wooden and soft rubber cutting boards are ideal because they are gentle on the edge.

    Glass, ceramic, marble, granite, or very hard plastic boards will dull even the best knife much faster.

    3. Don’t Twist or Pry

    Japanese knives are designed for precise slicing.

    Avoid twisting the blade while cutting or using it to pry frozen food, bones, or hard shells. Doing so can chip or damage the edge.

    Instead, let the knife do the work with smooth, controlled cuts.

    4. Store Your Knife Properly

    Never throw your knife loosely into a drawer.

    Use a knife block, magnetic knife rack, or a blade guard to protect the edge and improve safety.

    Proper storage also helps prevent accidental damage to the blade.

    5. Sharpen Before It Becomes Completely Dull

    Many people wait until their knife struggles to cut before sharpening it.

    In reality, regular maintenance keeps the knife performing at its best and usually removes less steel over time.

    A whetstone remains the best method for maintaining a traditional Japanese knife.

    Carbon Steel vs Stainless Steel

    Different steels require different levels of care.

    Carbon steel can develop a beautiful natural patina with use, but it should always be dried immediately after washing to prevent rust.

    Stainless steel is more resistant to corrosion and generally easier to maintain, making it a great choice for many home cooks.

    Neither is “better”—they simply suit different users and cooking styles.

    A Good Knife Is Meant to Last

    One of the greatest pleasures of owning a handcrafted Japanese knife is watching it improve with age.

    As the handle develops character and the blade is maintained over the years, the knife becomes uniquely yours.

    With proper care, a handcrafted knife isn’t simply a kitchen tool—it’s an investment that can accompany you through thousands of meals.

    At Asaoya Yaichi, we carefully select authentic handcrafted knives from Tosa, Japan, believing that quality craftsmanship deserves proper care and appreciation.

    If you’re looking for a genuine Japanese knife that will last for many years, we invite you to explore our collection.

    Browse our collection:
    https://www.asaoyayaichi.com.au

    Read more knife guides:
    https://blog.asaoyayaichi.com.au