What is a "double-edged knife"? How to choose one and its benefits

The answer to questions like, "Which was your first knife?" and "Can left-handed people use it?" is the "double-edged knife."

In this article, we will thoroughly explain everything from the basics of double-edged knives, which are a staple in households, to the differences between them and single-edged knives, the most common types such as Santoku and Gyuto, and even the differences in the "cross-sectional shape of the blade" that professionals pay attention to.

What is a double-edged knife?

As the name suggests, a double-edged knife is a knife that has been sharpened evenly on both sides of the cutting edge. Its most distinctive feature is the symmetrical "V" shape when viewed in cross section.

Most of the Santoku knives, Gyuto knives, and petty knives that are commonly used as "all-purpose knives" in the home fall into this category of double-edged knives.

This symmetrical structure results in the following features:

• Doesn't matter which hand you use: Most knives can be used by both right-handed and left-handed people.
• The blade goes straight into the ingredients: The force is evenly distributed when cutting, so the blade does not lean to one side, making it easy to cut ingredients straight and vertically.

In contrast to this are single-edged knives, such as sashimi knives (yanagiba) and deba knives. Single-edged knives have an asymmetrical cross section shaped like the letter "L" and are specialized knives unique to Japan that are specialized for specific ingredients and cooking methods (e.g., filleting fish, peeling).

How to choose a double-edged knife

When choosing a double-edged knife, it is important to consider how versatile and comfortable it is to use, rather than specializing it for a specific task like a single-edged knife. Here are five steps to help you find the perfect "partner" to suit your cooking style and kitchen environment.

Step 1: [Basics] Select the type based on "Main Use"

Double-edged knives are versatile, but their strengths vary slightly depending on their shape. Imagine your cooking scenario and choose the shape that best suits you.

• Santoku Knife: For those who want to handle meat, fish, and vegetables in a balanced way, this is the most common all-purpose knife in Japanese households. As the name "three virtues" suggests, it can be used to handle a wide variety of ingredients. If you're unsure which "first knife" to choose, this is the one to start with.
• Gyuto (chef's knife) - Also known as a chef's knife, it's perfect for cutting meat and large vegetables. It has a longer blade than a Santoku knife and a sharper edge. It's recommended for those who often perform dynamic tasks, such as cutting through the veins of a block of meat or cutting whole cabbage or Chinese cabbage.
• Petty knife : A small, maneuverable knife ideal for detailed work or as a secondary knife, such as peeling fruit, garnishing vegetables, and chopping spices. Having a petty knife in combination with a main knife like a Santoku or Gyuto knife will dramatically increase your cooking efficiency.

Step 2: Select the material under "Care"

The sharpness of a knife and the ease of daily maintenance are determined by the material. Choose the material that best suits your lifestyle.

• stainless:
  Features : The biggest advantage is that it is extremely resistant to rust and easy to maintain.
  Recommended for: Those who value simplicity and ease of use above all else, and those new to cooking.
  
  
• Composites (interrupts):
  Features: This material combines the best of both worlds, with sharp steel sandwiched between rust-resistant stainless steel.
  Recommended for: This knife is best suited to those who prioritize balance and want sharpness but are worried about rust.
  
  
• Steel:
  Features: Its outstanding sharpness and ease of sharpening are its attractions.
  Recommended for: This material is for advanced and professional users who prioritize sharpness and enjoy maintenance such as wiping it immediately after use and sharpening it frequently.

Step 3: Select the blade length based on "work efficiency"

The blade length of a knife is directly related to the size of your kitchen space and your hands.

Standard: Generally, a length that does not exceed the width (depth) of the cutting board is considered easy to handle.

• For Santoku knives: 165mm to 180mm is the most standard and well-balanced size for home use.
• For Gyuto : To maximize its versatility, a knife that is slightly longer than a Santoku, 180mm to 210mm, is popular for home use. Professionals sometimes use knives that are 240mm or longer.
• For petty knives: 120mm to 150mm is typical and is suitable for fine work.

Step 4: [Important] Select performance based on the "blade cross-sectional shape"

When choosing a double-edged knife, experts pay close attention to the cross-sectional shape of the blade. This difference has a big impact on the quality and durability of the blade.

1. Clam-shaped blade
   Features: The entire blade has a gentle curve, like a clam shell.
   Advantages: The rounded (thick) cutting edge makes the blade highly durable and less likely to chip. It gives you peace of mind when cutting hard ingredients. How to choose: Recommended for those who prioritize toughness (durability) and ease of use over sharpness.
   
2. With cutting edge
   Characteristics: Like a Japanese knife, it has a line called "shinosuji" and the blade is flat (cutting edge) from there to the tip.
   Advantages: The cutting edge can be sharpened (thinly) and is characterized by its sharpness. In addition, when sharpening, the angle is determined simply by placing the flat surface of the cutting edge against the whetstone, so it has the advantage of being very easy to sharpen. How to choose: Recommended for those who value sharpness and ease of sharpening when sharpening using a whetstone themselves.

Step 5: Choose a handle based on grip comfort and center of gravity

The handle structure affects the overall weight balance (center of gravity) of the knife and how comfortable it feels to hold.

1. Western knife handle (rivet handle)
   Characteristics: Most Santoku knives and Gyuto knives are of this type. The metal core that continues from the blade penetrates all the way to the end of the handle and is secured with rivets, creating a sturdy structure. Center of gravity: The center of gravity tends to be closer to the handle (heavy on the butt), giving it a sense of stability. Advantages: It is very sturdy, water does not easily get inside the handle, and is characterized by its high durability.
   
   
2. Japanese knife handle (sashi-gaki)
   Characteristics: Found in some double-edged knives, such as "Wagyuto." It has a traditional structure with a thin metal core (core) that continues from the blade inserted into a wooden handle. Center of gravity: The center of gravity tends to be at the tip of the blade (the blade is heavy), which is said to make it easier to control delicately with your fingertips. Advantages: It is characterized by its light weight and soft grip.

There is no superiority or inferiority between the two, so it is best to try them out and choose the one that feels most comfortable in your hand in terms of weight balance and grip feel.

FAQ

Q1: What is the biggest difference between a double-edged knife and a single-edged knife?

A: The biggest differences are the structure and purpose. Double-edged knives have a V-shaped blade that is symmetrical. Like a Santoku knife, they are versatile and can be used by either the right or left-handed person. Single-edged knives have a V-shaped blade that is asymmetrical. Like a sashimi knife, they are highly specialized and are available for both right-handed and left-handed people.

Q2: Can left-handed people use it?

A: Yes, you can. Double-edged knives have symmetrical blades, so they can be used by either right-handed or left-handed people. On the other hand, single-edged knives have an asymmetrical structure, so you must purchase separate ones for right-handed and left-handed people.

Q3: I heard that single-edged knives are sharper. Is that true?

A: The correct answer is that single-edged knives have a different quality of sharpness (the cutting methods they are good at). A single-edged knife is designed to cut food thinly horizontally or diagonally, like peeling or shaving, and has less resistance due to its structure, resulting in a smooth cutting feel. A double-edged knife has the advantage of being able to cut steadily and without wobble when cutting straight vertically.

Q4: Double-edged knives all look the same, but are there different types?

A: Yes, there are two main types depending on the cross-sectional shape of the blade. 1. "Clamshell Shape": A type in which the entire blade has a gentle curve. It is characterized by its high durability. 2. "Shape with Shinogi and Kiriha": A type in which there is a clear line (shinosuji) on the side of the blade, and from there to the tip is a flat surface. It is characterized by its sharpness and ease of sharpening.

summary

The four most important points about double-edged knives explained in this article can be summarized as follows:

• Double-edged knives are the "all-purpose knives" that support home cooking
• Symmetrical (V-shaped) structure makes it suitable for both left-handed and right-handed users
• The key to choosing is the type (purpose) and the cross-sectional shape of the blade (performance).
• The quality of sharpness (perpendicular cutting) is different from that of a single-edged knife.

Double-edged knives are "all-rounders" that have evolved from a Western food culture (meat-eating) to suit the Japanese home environment (meat, fish, and vegetables). Examples of double-edged knives include the Santoku knife and Gyuto knife, which are stable and allow you to "cut straight" without worrying about force or direction, and are truly the standard for home cooking.

Of course, because of its versatility, it may not be as sharp when it comes to delicate tasks that require minimizing the resistance of ingredients, such as peeling and shaving, which are the specialties of single-edged knives.

However, a double-edged knife is not just a cutting tool. It is your first partner in the kitchen, accompanying you in your daily cooking, reducing the stress of cooking and helping you enjoy cooking every day.

Using the selection tips introduced in this article (type, material, blade length, and blade cross-sectional shape), we hope you will find the "best one" that will enrich your cooking life.