Everything You Need to Know About Knives

"Any good cook will tell you a good-quality knife is the most important tool in the kitchen."Meathead

Hone Your Chops With Our Ultimate Guide to Knives

The first crude knives were invented more than two and half million years ago. These tools improved our ability to survive, and, apart from our hands, they have evolved into the single most important tools in food preparation and cooking. Early knives were made of flint, but most modern kitchen blades are made of metal or ceramic. Chef’s knives may be sharp enough to cut the glaze on a dinner plate, but clam, oyster, and butter knives are made intentionally dull.

Regardless of what knife you use, cutting results from various forces working between the knife and the food. The cutting edge of a knife concentrates all of the force exerted by the user on a very narrow but long area. That force delivers a fine line of pressure that’s strong enough to sever tissues, slash through plant and animal cell walls, and even cut through bone. Serrated knives further concentrate the force into a smaller area on the serrations, making cutting more swift. Sharper knives require less pressure and make cleaner cuts. This means that sharper knives damage fewer plant and animal tissues and cell walls, releasing fewer compounds from the cells, such as the sulfur compounds in onions that make us cry. Yep. If you want to shed the least tears when chopping onions, make sure you use a sharp knife.

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Basic Knife Parts

All knives have essentially the same parts with a few exceptions for special knives. The illustration here identifies the basic components of a typical forged chef's knife.

Forging, Stamping, and Tang

For a sturdy blade, look for knives that are fully forged and full tang, meaning they are made from a single piece of metal that is beaten to strengthen it, ground into shape, and extends from the blade to the back of the handle, where it is usually riveted into place. Stamped knives cut from sheets of metal are often less durable than forged knives. One of the best knives you can buy is a forged, full tang chef's knife. For a much deeper dive into knife manufacturing methods and metallurgy, read our article on The Science of Knives.

How to Hold a Chef's Knife

Most kitchens have a variety of knives for cleaving bones, paring strawberries, and slicing bread. But the chef's knife is the most important one. This all-purpose knife handles routine chopping and slicing duties and has a slightly curved blade so you can rock it back and forth to chop quickly.

When handling knives, don’t be shy. Grab a chef's knife like you mean it. Hold the handle but also hold the back edge of the knife right behind the heel of the blade. When your fingers hold some of the blade, you get more control over the knife. Stand with the knife perpendicular to the food you’re cutting. As you cut, keep the tip of the knife pointed down and let the blade and the weight of your body do most of the work. The knife should mostly move forward and backward to slice. It shouldn’t take much downward force. With your other hand, hold and guide the food. Arch your fingers like an eagle’s claw to grasp the food, but tuck your thumb behind your fingers to keep from cutting yourself. It helps to rest the blade against your arched fingers. Then you can slowly move your arched hand and the knife blade together as you cut the food. Aim to cut food into same-size pieces so they cook at the same rate. There’s also some research showing that different knife cuts, such as long slices on an angle, expose more surface area and release more flavorful compounds from the food. So try to cut the food the way it’s suggested in any given recipe. It makes a difference!

Basic Knife Care and Sharpening

To keep your blades at their sharpest, avoid extreme downward pressure, and cut only on knife-friendly surfaces like wood and plastic. These materials absorb some of the knife blade and delay dulling. They also make cutting steadier, swifter, and safer. Glass, stone, and metal surfaces will dull your blades quickly. Hone your knife every few uses, and sharpen your knives whenever they are too dull to cut cleanly through the skin of a tomato without squashing the tomato. Click here to find out how to properly hone and sharpen a knife. And click here for our guide to the best knife sharpeners.

When it comes to cleaning, most knives are best washed by hand to avoid discoloring the blade and damaging the handle, especially is the handle is made of wood. Avoid the dishwasher. The high heat of a dishwasher can cause microscopic movement in molecules in metal blades and the salty detergent can weaken the steel. The chemicals might also create some spotting, which can later become rust. As for storage, you should keep your knives in slots, sleeves, racks, or on a magnetic strip to protect the cutting edges from damage and dulling. If you want to dull your knives in a hurry, keep them in kitchen drawer full of other knives and gadgets.

What To Look For When Selecting Knives

Unless you're Bigshot Chef at Bigshot Restaurant, there's no reason to buy a full set of umpteen different knives. Just be sure to stock 3 top-quality blades: a chef's knife (for chopping, slicing, dicing, and gesticulating when talking with guests), a paring knife (for you guessed it), and a serrated knife (for bread and tomatoes).

A great chef's knife makes food prep so much easier. If you're going to spend a chunk of money on a knife, here's where it should go. What size? If you're big and strong, you'll probably be comfortable with an 8 or 10 inch blade or even a 12 inch if you're serious. If you're smaller in stature or a control freak, you may want to use a smaller, lighter chef's knife like a 6 inch knife or even a 5 inch santoku (Japanese all-purpose knife).

Size matters but not as much as feel. You have to feel comfortable holding the knife, and all knives differ in weight distribution, balance, grip contour, materials, and construction. Before you buy anything, go somewhere (yes, out of your house), and pick up a few knives. A good knife should make you want to use it. It should feel comfortable and be easy to grip. The right knife for you is the knife that feels best in your hand.

Some of our favorite knives right now are coming from Günther Wilhem. The GW Lightning ProCut and Premier ProCut knives are well balanced, durable, sharpen easily, retain their edges well, and work like dogs in the kitchen. Plus, they are drop dead gorgeous. Click here to read more about Gunther Wilhem knives

And check out the links below for everything else you will ever want to know about knives from metallurgical science to using a whetstone to buying a decent electric knife for slicing brisket.

Henckels chef's knife
At least one good chef's knife is the most essential tool in any kitchen. Does that mean you need to spend hundreds of dollars on an entire set of knives? No. Just a few good quality knives are all you really need. read more
photo of electric knives we tested
We test, compare, rate, and review popular electric knives. An electric knife makes quick work of slicing a big hunk of meat like turkeys, whole packer briskets, beef tenderloin, prime rib, crown roast of pork, and hams. They are great at making even cuts. read more
Gunther Wilhem honing steel
Sharp knives cut. Dull knives slip. Stay safe by keeping your knife sharp. Here's a guide to honing and sharpening your knife using a honing steel and sharpening stones. read more
Images of a sharp blade, a dull blade and a resharpened blade
It's vital to keep your knives sharp. But not all knife sharpeners do a great job. And they're all built a little differently. Check out our reviews before you buy. read more
Kanehiro VG10 nickel damascus black finish gyuto chef's knife 210mm
Before you drop serious cash on a knife, bone up on what distinguishes a good knife from a great one. Different metals, shaping techniques, and manufacturing technologies all influence how a knife sharpens, dulls, feels in your hand, and holds up over the long haul. Here's what goes into making a great knife. read more

Takeda aogami knife on cutting board

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