View How To Keep Onions From Making You Cry Images. I found chopping onions makes it hard to remember to keep chewing. But why do onions make us cry?
This causes a chemical reaction and creates a lachrymatory agent, similar to the chemicals used in tear gas. You've really got to be a pro at slicing and dicing them without getting frustrated, and even then they can still make your cry—literally. Supposedly, the more you cook with onions and endure their sting, the less they'll affect you over time [source:
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Onions make you cry because they release a sulfenic acid in gaseous form. The theory behind this is, that the gas released from onion gets absorbed by the water rather than the eyes. How can you keep from crying while chopping an onion? Onions make you cry because they release a sulfenic acid in gaseous form.