Best Knife for Slicing Onions in 2022 | Top 10 Picks by An Expert

Do you want to know the most beneficial knife to have in your kitchen for all of your cooking needs? Well, the answer to that may depend on what you are planning to cook.

When you need to slice onions in the kitchen, you may wonder, What makes a good knife for slicing onions? You may be looking for a lightweight, well-balanced blade made of high-quality steel that is comfortable.

With the help of this article, you will better understand what makes knives and learn how to choose the right one. You will also learn about their types and some basic FAQs about knives.



Editor's Rating


Farberware (5158145) Knife, 5-Inch EdgeKeeper

5 out of 5

Mercer Culinary Knife (M20707) 7-Inch

5 out of 5

Gladiator Series Dalstrong 7" NSF Certified Knife

4.5 out of 5

TUO Japanese Chefs Knives 7 Inch

4 out of 5

Professional Chef's Knife DDF iohEF 7

4.5 out of 5

Here Are Five of the Best Knife for Slicing Onions

Choosing the right knife for slicing onions is important to make sure that you can efficiently and quickly do the cutting. Following is a list of some of the best knives for cutting onions:

1. Farberware (5158145) Knife, 5-Inch EdgeKeeper

The Farberware EdgeKeeper sheath leaves its blade razor-sharp with each use, so you can always rely on sharpening precision. The blade of this knife is made of high-carbon stainless steel, which is super sharp, durable, and has strength.

EdgeKeeper sheaths come equipped with a honing mechanism included before and after use. Safely remove the knife from the sheath by lifting up on the case and gently pulling to remove the knife. This ensures the sheath will stay on the knife while stowed.

The ergonomically designed handle offers exceptional usability and an easy comfortable grip when in use. Use a soft cloth with warm water, and a gentle dishwasher-safe solution if needed. Rinse thoroughly and dry with a clean cloth before replacing in the storage sheath.

This knife has a wide, heavy blade that has the characteristics of a chef's knife and of a cleaver like that it has an extremely wide and heavy blade that can be used for chopping onions, cutting, as well as dicing.

The knife with its broad blade and the narrow cutting edge is used similarly to a chef's knife and also like a cleaver. This versatile chef's knife is the most commonly used in most Western kitchens, where it has largely replaced traditional kitchen cutlery.

Highlighted Features:

  • Handles designed for comfort
  • Honing mechanism included Before and after use
  • Sharp, and high carbon stainless steel construction
  • Before and after use sharpening mechanism

2. Mercer Culinary Knife (M20707) 7-Inch

The Mercer Culinary Chef's Knife Genesis is a knife and chef's essential which was designed for precision cutting vegetables, fruits, meats, and fish.

The Santoprene handle offers comfort as it stands up to tough ingredients or repetitive use. The chef’s edge blade features high-carbon German steel edges that are taper ground so they have a long-lasting sharpness and won't be easily dulled.

This makes cutting more enjoyable and efficient without breaking your wrist or using too much force. Handle balances weight distribution making tasks easier for mid- to senior-aged adults. There is an NSF certification and a limited lifetime warranty.

So, if you are looking for a knife to cut onions, make sure it has a blade that can keep its sharpness during heavy use or often tasks. The thickness of this blade should also be just right for your needs.

And if you are looking for the most reliable knife set, select one that has all the right ones for your kitchen. This includes all the right sizes and types of cutters for every task.

Highlighted Features:

  • A German steel blade with a high carbon content
  • Comfortable grip with Santoprene, NSF-certified
  • For superior balance, the handle is a full tang
  • Non-slip and safe grip handles heat and cold
  • Limited lifetime warranty

3. Gladiator Series Dalstrong 7" NSF Certified Knife

The Gladiator Series knife is a chef’s go-to knife that combines chef’s quality and power with blade length, strong scoops, lightweight, comfort, and dependability.

The hand-polished bolster adds a counterweight to the feel of this chef's knife-designed cutting knife for chopping. Its triple riveting (with a Dalstrong center rivet) ensures strength and robustness.

Whether you are just a home chef or working at a restaurant, you will appreciate the size of the chef's knife that easily fits into your hand. An NSF-certified chef knife is ideal for chopping onions, meat, and firm vegetables.

The lightweight, 7" chef's knife is perfect for chopping vegetables. The gladiator series chef's knife has excellent edge retention for heavy use. The chef's knife features an ergonomic, water and stain-resistant handle. The chef's knife is dishwasher safe for easy cleaning.

A multi-purpose knife is also known as a utility knife. These cutlery kitchen tools have a blade with a flat edge and a large bevel on the front. However, while these cutters are not only perfect for onion cutting knife, they can also be used to chop other food items such as boneless meats and fish.

Highlighted Features:

  • High-Quality Steel
  • Lightweight
  • Well-balanced blade
  • Comfortable to use
  • Sharpness is maintained even during heavy use
  • This blade's thickness should suit your needs

4. TUO Japanese Chefs Knives 7 Inch

The TUO Japanese knife is handmade with the most durable materials to make sure you have a lasting chef knife. The hardness of each blade is up to 56± HRC ensuring easy honing, increased efficiency, and long-lasting sharpness.

The chef's knife is made of high carbon steel no-stain German stainless steel, which uses the most modern forging technology. As it is hand sharpened on both sides, you can be more confident when cutting up vegetables, onions, fruit, meat, and fish.

The ergonomic Pakkawood handle fits comfortably in your hands so that it doesn't slip out. Chef's knives come with blade protectors to keep them safe while storing.

Whether you are a chef cooking at home or in the professional kitchen, this is one of the most solid tools you can own.

The cook's knife will become your most frequently used kitchen tool. With ergonomic design handles, they are very easy to use for their lightweight and comfort.

Highlighted Features:

  • Full Tang Design
  • High-Quality Handcrafted Material
  • Ergonomic Pakkawood Handle
  • Sharp and Cuts Precisely
  • Well Balanced

5. Professional Chef's Knife DDF iohEF 7 Inch

The chef knife of DDF iohEF is manufactured with professional German stainless steel, which has a carbon content ranging between 0.45% and 0.55%, with a chromium content of 14%-15%.

You can use it without the risk that it will not dull, crack, or roll over time because by using high-quality German steel it achieves excellent hardness, durability, and control.

These chef's knives come with a double-edged blade design which allows both left-handed and right-handed user-friendly needs. This chef's knife is a perfect gift for your family and friends because of its unique design.

Also, it has the perfect balance between the blade and handles which gives you great comfort to minimize fatigue, numbness, or pain.

The chef's knife of DDF iohEF is multi-functional. You can perform a variety of daily kitchen tasks such as chopping, dicing vegetables, fruits, onions, meat, and cheese.

So, the chef's knife of DDF iohEF is the right knife tool for serious cooks. It has 8 working methods to cut the edges of the blade, taking into consideration the proper ratio between hardness and sharpness to make a thinner blade.

Highlighted Features:

  • 100% Satisfaction Guaranteed.
  • High-Quality German Stainless Steel.
  • Anti-slip Handle Design for Comfortable Grip.
  • Double Sides 15° Blade Angle for Left-Handed and Right-Histed Users
  • Perfect Gift for Your Family and Friends.

So there you have it! The top 5 knives brands you need to consider for dicing onions. Now, what are some things you need to consider before buying one?

A Guide to Purchasing Onion Slicing Knives

A Guide to Purchasing Onion Slicing Knives

When it comes to choosing chef knives to slice onions, you should consider the following characteristics:

Knife Type

The chef's knife is the most commonly used in homes since it has a blade that is between 6 and 14 inches long. This type of chef's knife can be used to do any cutting job, but it is especially effective when processing vegetables including shallots.

Steel Type

If you want the most reliable chef's knife for trimming produce, make sure that it is made of high-quality steel material that has a hardness between HRC 56 and HRC 60. Also, having a chef's knife with a full tang design will make it stronger and more durable.

Blade Thickness

The thickness of many of these should be about 6mm. Laser-cut cutting edges that are too thin can lead to structural weakness, while blades that are too thick will make them difficult to use for food preparation tasks.

Handle Type

The handle of the knife comes in two types: molded handle or wood handle. Always go for chef cutlery with ergonomic design handles. These kitchen tools will fit comfortably in your hands and give you great control over the blade.

Weight and Balance

Weight and Balance

When using a chef’s knife as an onion knife, always choose a chef's knife that has the right weight and balance. A chef's knife with a well-balanced weight is easy to use and more comfortable in the hands than those kitchen items that are too light or too heavy.

Manufacturer's Reputation

Choose a high-quality super-sharp chef's knife, which has been tested by the manufacturer to resist bending or breaking when cutting the onion.


In order to get kitchen tools that are worth your money, choose chef blades that have good quality steel and a full tang design. You can not only slice an onion with these tops but also use them for a variety of other tasks in the kitchen.

By considering these important characteristics, you can choose the ideal knife for cutting onions for your needs. Choosing a high-quality knife will save you money in the long run since you won't need to buy another one very soon.

Chef Knife Types You Find for Chopping Onions

  • Western Chef's Knife
  • Gyuto Knife
  • Paring Knife
  • Utility Knife
  • Santoku Knife
  • Chinese Cleavers
  • Nakiri Knife
  • Boning Knife
  • Multifunctional knife

The Faster and Proper Way to Chop Onions

The faster and proper way to chop onions is by knowing the correct chopping method which can help you not only save time but also make your cooking easier.

Vertical Cutting Method

The vertical cutting method is the traditional way of cutting an onion. The kitchen worker holds the knife with his/her dominant hand and places it on top of the onion. Then, begin to slice vertically from the stem end up until you reach the root bottom.

Horizontal Cutting Method

Horizontal Cutting Method

The horizontal cutting method is similar to the vertical cutting method but instead starts at a point below where your fingers are holding the onion. Then, slice horizontally toward the stem end and then rotate the onion to complete your cutting job.

Frequently Asked Questions

The most common question that people ask whenever they choose a knife is the following:

1. What Can I Do To Stop Crying While Cutting Onions

It's a common question to ask and the answer is quite simple. Chopping them can cause tears because of their acidic content. You can reduce tear formation by making sure to use a super sharp blade. Chopping with a dull blade will force you to apply more pressure and in turn, cause you to tear more.

Chopping the onion under running water or by holding it under flame can also cause you to cry since both methods direct the gas directly into your eyes and irritate them. Chopping the onion without cutting into the root end will also help reduce tear formation.

2. Are Sharp Knives Helpful When Cutting Onions?

Chopping the onion with a sharp knife will help you cut faster and more efficiently. Chopping onions with dull knives can be frustrating because it requires more pressure to use and dull ones can cause you to slip.

Chopping onions with as sharp a knife as possible is much safer, especially when using a fancy chef's knife. Chopping onions with a sharp knife is also much faster and more efficient because it requires less effort to cut into the onion.

3. On a Cutting Board, How Should I Cut Onions?

Chopping onions on a cutting board is all about using the right boards and knives. Chopping on a wood cutting board is better than plastic, glass, or steel because the ingredients will not damage it.

On a Cutting Board, How Should I Cut Onions

4. Can You Use A Pocket Knife to Cut Onions?

Yes, but pocket knives are not good for cutting onions because they don't have a sharp blade and it is difficult to hold the knife in place. Chopping onions with a pocket knife can cause the knife to slip and cut your hand or fingers.


Choosing the right type of knife for your needs is very important. Make sure to purchase a knife that can keep its sharpness so it can cut onions with ease. We hope that this article has given you enough information for choosing the best knife for cutting onions to meet your needs.