There I was, tears streaming down my cheeks not from sadness, but from chopping an onion. If you cook, you know the feeling. That pungent aroma that travels through your entire apartment, and those tears that just won’t stop.
But why does this happen, and is there really a way to stop it ; The answer lies in the onion’s defence mechanism. When we cut into an onion, we break its cells, releasing an enzyme called alliinase. This enzyme produces sulfur compounds designed to “annoy and repel” predators including us. Those compounds irritate our eyes, nasal passages, and mouths, leaving us blinking back tears.
The good news ! There’s a simple solution. A technique shared by food writer Nik Sharma in his book Veg-Table: simply refrigerate your onion for an hour or two before cutting. The cold temperature slows down the enzyme activity, meaning fewer tear-inducing compounds; I was sceptical at first, but after trying it myself not a single tear. Now I’m a true believer, and I’ll never chop an onion without popping it in the fridge first.
Why It Works in a Nutshell
- Cutting an onion releases an enzyme that produces tear-inducing sulfur compounds.
- This enzyme is more active at warmer temperatures.
- Cold temperatures slow it down significantly.
- Refrigerating for 1–2 hours reduces irritation, making chopping tear-free.
Tear-Free Onion Tips
- Pop it in the fridge : 1 to 2 hours before chopping is all you need. No tears!
- Freeze for 10–15 minutes : Short on time ? This works too, but don’t freeze solid.
- Use a sharp knife : A sharp blade causes less cell damage, releasing fewer irritants.
- Cut near a vent : Position your board near an exhaust fan to draw fumes away.
- Wear goggles – : Yes, it looks silly. But it works if all else fails.
- Chill before peeling : Cold onions are also easier to peel cleanly.
Enjoy tear-free onion chopping! 🧅✨