How to Prevent Onion Tears

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How to Prevent Onion Tears

No, you're not getting emotional—those tears are thanks to Propanethiol S-oxide, a gas released when onion enzymes are broken down. When this gas reaches your eyes, it forms a mild sulfuric acid that makes them sting and water.

Luckily, there are a few clever tricks to stop the sobbing:

How to Prevent Onion Tears

πŸ”ͺ Use a Sharp Knife

A razor-sharp blade slices cleanly through onion cells instead of crushing them, releasing less gas.

❄️ Chill Before You Chop

Pop your onion in the freezer for 10–15 minutes before cutting. Cold onions release less of the irritating gas.

🌬 Improve Ventilation

Open a window, turn on your kitchen fan, or work near an extraction hood to blow the fumes away from your face.

πŸ’§ Slice Underwater (If You Dare)

Cutting onions under water does reduce gas exposure—but it’s slippery business. Watch those fingers!

🌱 Leave the Root Intact

The root end contains the highest concentration of tear-inducing compounds—so leave it on as long as possible while cutting.

πŸ₯½ Onion Goggles?

They might look silly (and fog up), but hey—if they work for you, no judgement!


At Otao Kitchen, our chefs have mastered the art of tear-free onion prep. Join one of our cooking masterclasses and learn pro tips like these—without the tears!

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