Why do onions make you cry?
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It turns out that sulfur, which is utilized by onions in several amino acids, is very well-absorbed by onions. An onion’s slicing process splits apart cell after cell, revealing its liquid contents. Syn-propanethial-S-oxide is a compound that is produced when previously separated enzymes combine with sulfur-rich amino acids to make unstable sulfenic acids.
This sneaky substance is volatile, meaning it vaporizes quickly. It burns your eyes when it evaporates and floats up off the cutting board. Your brain immediately initiates a tear reaction to wash the irritating substance out of your eyes in an effort to preserve your priceless vision.