You know that sting when the onion is halfway chopped and your eyes are already streaming? I used to treat it as a fact of cooking, like a hot pan. Then my aunt, who runs a tiny diner and chops onions by the bucket, told me the cry has almost nothing to do with the knife.

The gas that makes you tear up forms when you break the onion’s cells. Cold slows that reaction way down.

Chill It First

Put the onion in the freezer for about fifteen minutes before you cut it. Not to freeze it solid, just to get it cold. I keep a dedicated onion spot in my freezer drawer so I never forget.

The difference surprised me. A cold onion still smells like onion, but the sting is barely there.

Cut the Root Last

The root end holds the highest concentration of the compounds that make you cry. Cut it off last, and leave as much of it attached as you can while you dice. That one change cut my tears maybe in half.

Use a Sharp Knife

A dull knife crushes cells instead of slicing them, which releases more of the gas. I sharpened my chef’s knife one Sunday afternoon and every vegetable prep got easier, not just onions.

Other things that help:

• Run the onion under cold water before peeling
• Chop near an open window or under the vent fan
• Wear glasses or goggles if it is really bad, no shame in it

The freezing trick works best for me. I cut two onions for dinner most nights and I cannot remember the last time my eyes burned.