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    Onions are a bulbous vegetable that belong to the Allium cepa species. The outside skin of these onions is actually a shade of purple, while the insides are white with a hint of dark red, turning slightly blue when heated. They have a sweeter, milder taste compared to yellow and white onions but can still be pungent depending on their size and how they are prepared. Although the first red onions are thought to have grown in Asia, they are now cultivated in most regions of the world. As people began to grow and harvest the onions, they came to realize that they last for an extended period of time without rotting. On average, a red onion can generally be stored for at least one month without any signs of deterioration. Above ground, the onion shows only a single vertical shoot; the bulb grows underground, and is used for energy storage.