Cut an Onion With No Tears or Mess Using This Quick Tip

Cut an Onion With No Tears or Mess Using This Quick Tip

This story is part of Try ThisCNET’s collection of simple tips to improve your life, fast.

If you’re a regular cook, you know how often you need to slice or dice an onion. It’s the foundation of recipes around the world — and many around our own families’ tables.

Cutting onions brings visions of teary chefs, but it doesn’t need to be so painful. I’ve been using a basic cooking technique for decades now that makes dicing onions easy and neat. And I’ve found there’s another big bonus — fewer tears while cutting any type of onion.

See my method below for quickly dicing an onion and learn why it prevents tears, along with some other ways to avoid crying while cutting onions if you are particularly sensitive. For more tips around the kitchen, learn how to avoid jabbing yourself while pitting an avocado, make a cake without a pan and cut a cake without a knife. For safe slicing and dicing, check out our picks for best chef’s knives and best direct-to-consumer knives.

Why do people cutting onions cry?

Onions are in the allium genus of flowering plants that includes garlic, leeks, shallots and chives. They grow as bulbs under the ground and include toxic substances in their roots to protect themselves from moles and other underground pests. Those toxins are strong enough to poison cats and dogs.

Onions take sulfur from soil to create amino acid sulfoxides. When an onion is cut, those sulfoxides combine with other enzymes in the onion to create sulfur gas. When that gas interacts with the moisture around your eyes, it creates sulfur dioxide, which burns and causes your eyes to water.

How do I cut an onion without crying?

Most of the onion’s sulfoxides reside in its root — the round part with hairs at the bottom of the onion. If you can leave the root untouched, you’ll significantly reduce the amount of chemicals that make you cry when cutting.

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One simple method is to chop off the root end and then discard it when you start. You can then say the rest of the onion however you like.

This way works fine, and if you want to stop there, great. But I think my method is even better because it avoids dicing the root while letting you easily work with the rest of the onion.

First, cut the onion lengthwise, from tip to root. (Yes, this will cut the root in half, but it’s the only time you will cut it.) Then remove the inedible outer layers, and slice off the tip of one half.

Now you’re ready to say. Make a series of slices across one of the halves horizontally, starting half an inch from the top. Most importantly, stop slicing before you reach the rootso you leave the onion connected at the root end.

Next, make a series of vertical cuts with the tip of your knife pointing toward the root, starting at one side and moving to the other. Again, don’t cut into the root end — slice down the onion with the tip of your knife stopping short of the root. Careful: These cuts provide the biggest chance for making a mistake and accidentally slicing the root.

To finish dicing the onion, make a third series of slices starting at the end farthest from the root and moving your knife gradually closer with each cut. These slices will separate your diced pieces from the rest of the onion.

Finish your final vertical slice right before you reach the root, which can be tossed, leaving you with a nice, neat pile of diced onion. Repeat this process with the other half of the onion to finish your preparation.

How else can I not cry when cutting onions?

I wear contact lenses, which offer protection against onions’ sulfur output, so I am less susceptible to crying when cutting. If you try my dicing method and still find yourself in tears, there are a few other tricks you can use to reduce the effect.

First, try refrigerating your onions briefly before cutting them. The National Onion Association recommends chilling onions for 30 minutes before preparation. The colder temperature will slow down the sulfur gas, it says, causing less reaction with your eyes. (The organization also recommends keeping the root intact.)

Next, try sharpening your knife. A dull knife will smash the onion more than a sharp one and may release more of the offending sulfoxides.

Lastly, if you’re still crying, try cutting your onions under a ceiling fan or kitchen vent. Both may help dissipate the sulfur gas before it attacks your eyes.

If you’re looking for more tips, here’s how to get rid of junk mail, see what’s coming in the mail and start a fire with Doritos.

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