Of all the jobs in the kitchen, chopping an onion is often the one we dread most. The moment the knife goes in, the eyes start to sting and tears begin to flow on their own. The good news: this is not an unbeatable problem. A handful of small kitchen habits can take almost all the sting out of it. First, let's understand why it happens at all — then walk through the tricks that actually work.
Why does slicing an onion make you cry?
The answer lies in the onion's own chemistry. When the knife ruptures the onion's cells, they release a gas called syn-propanethial-S-oxide. As soon as this gas reaches your eyes, it mixes with the moisture there to form a mild acid. The result is the familiar burning sensation and the tears you can't hold back. In short, the whole problem comes down to this one gas — which means the trick to staying tear-free is simply keeping that gas in check.
Four ways to keep the tears away
1. Save the root for the very end
Most people reach for the root first and lop it off straight away — and that is exactly where they go wrong. According to actress and celebrity chef Amrita Raichand, the tear-triggering enzymes are concentrated in the onion's root. So the instant your knife hits the root, the tears begin. Her advice: slice the onion in half with the skin still on first, then peel it and chop it into small pieces. The longer you leave the root intact, the easier on your eyes it will be.
2. Soak it in water before chopping
Sarin, the popular food blogger behind 'Food Talk with Sarin' on YouTube, offers another simple hack. Peel the onion first, cut it in half, and let it sit submerged in water for five to ten minutes. After ten minutes, take the onion out and only then chop it finely. The water absorbs the gas before it can escape, so far less of it reaches your eyes — and the tears stay away.
3. Always use a sharp knife
Sarin also stresses the importance of reaching for a well-sharpened knife. A blunt blade crushes the onion's cells instead of slicing cleanly through them, which releases a lot more gas and makes the burning worse. A sharp knife damages fewer cells — meaning less gas and far less discomfort.
4. Chill the onion in the fridge first
Another highly effective method is to put the onion in the fridge for 20 to 30 minutes before you cut it. Once it's cold, the amount of gas the onion gives off drops significantly, and the irritation in your eyes eases considerably. With a little planning ahead, this trick works every time.
Use any one of these four methods, or combine them — and chopping onions will no longer be a tearful chore.
