Tired of watery eyes every time you chop onions? As a seasoned home cook, I've tested these 7 effective techniques to cut onions tear-free.
Each method targets the same culprit: the allinase enzyme released when slicing onions, which irritates eyes like mild tear gas.
Proven in real kitchens, here are practical ways to avoid it.


Submerging the onion in water prevents gas release. It's simple, though cutting underwater takes practice.

A lit candle nearby burns the gas before it reaches your eyes—perfect for candlelit prep.

Gas clings to your knife blade. Run it under hot water frequently while chopping—relief is instant.

A diving mask seals off eyes and nose. Extreme but foolproof—who says kitchen gear can't be fun?

Freeze onions for 15 minutes—cold slows the enzyme. Refrigerating works too for milder results.

Got a range hood? Crank it on high to vent gases away effectively.

It really works—test it yourself. For skeptics, combine them: freeze, rinse, candle, hood, mask, spoon in mouth, hot knife rinses. Overkill? Maybe, but tears? Never.
Master these, and onion chopping is tear-free forever.