Chopping onions can quickly turn a kitchen into a tear-fest. But why do our eyes water, and is there a way to
stop tears before they start? Let’s break it down.
1. The Science Behind onion TearsOnions release a
sulfur compound when cut. Here’s what happens:Cutting the onion
damages its cells, releasing enzymes called
alliinases.These enzymes react with sulfur-containing compounds to form
syn-Propanethial-S-oxide, a volatile gas.When this gas reaches your eyes, it
irritates the tear glands, making you cry.In short, your tears are a defense mechanism to
wash away the irritant.
2. Chill the onion Before CuttingCold onions release
less gas. Simply:Refrigerate or freeze the onion for 15–20 minutesCut while cold to reduce the amount of tear-inducing compounds
3. Use a Sharp KnifeA dull knife
crushes the onion cells instead of slicing cleanly, releasing more irritants. A sharp knife means
fewer tears and cleaner cuts.
4. Cut Under Running Water or Near SteamRunning water washes away the sulfur compounds before they reach your eyesAlternatively, cutting near a
steam vent or boiling water can redirect the gas away
5. Wear GogglesSpecial
kitchen goggles or even swimming goggles create a barrier, preventing the gas from reaching your eyes.
6. Light a Candle NearbyThe flame can
burn off some of the sulfur compounds before they reach your eyes. Place a candle close to the chopping area.
7. Chew Gum or Breathe Through Your MouthChewing gum encourages you to
breathe through your mouth, reducing eye irritationSome suggest this method can help, though results vary per person
8. Peel and Cut StrategicallyLeave the root end intact as much as possible; it has the
highest concentration of sulfur compoundsCut the tip and outer layers first
Key TakeawayCrying while cutting onions is
natural, but a few smart hacks—
chilling, sharp knives, goggles, or strategic cutting—can save your eyes and make cooking much more pleasant.
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