Onions are a perennial herb, most often grown and harvested as an annual, with fleshy, hollow, bluish-green leaves and an edible bulb at the base . The bulb, formed by swollen leaf bases, is a round or slightly flattened structure with a brown or colored skin and white, layered flesh. Onions are known for their pungent flavor and strong odor, caused by volatile sulfur compounds.

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