Onion

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Common onions are normally available in three colour varieties:

Yellow or brown onions (called "red" in some European countries)[example needed][citation needed] are sweeter and are the onions of choice for everyday use in European cuisine, with many cultivars bred specifically to demonstrate this sweetness (Vidalia, Walla Walla, Cévennes, "Bermuda," etc.). Yellow onions turn a rich, dark brown when caramelised and give French onion soup its sweet flavour.
Red or purple onions ("purple" is used in some European countries) are known for their sharp pungent flavor and are the onions of choice for everyday use in Asian cuisine. They are also used raw and in grilling.
White onions are traditional in classic Mexican cuisine, and are milder in flavor; they have a golden colour when cooked and a particularly sweet flavour when sautéed.