[Answer] What gives onions their distinctive smell?

Step 1 : Introduction to the question "What gives onions their distinctive smell?"

...When onions grow, one of the things they absorb from the soil is sulphur. When an onion is damaged through cutting or crushing, a volatile sulfur compound is released into the air. The sulfur-containing compounds are the flavor precursors that give rise to the characteristic odor and flavor of onions. Although many sulfur compounds have a strong smell, the pure element is odorless. Sulfur compounds are also why onions make you cry, why asparagus gives urine a weird odor, why garlic has a distinctive aroma, and why rotten eggs smell so horrible.

Step 2 : Answer to the question "What gives onions their distinctive smell?"

Sulfur:

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