Leeks are a vegetable that belong to the same family as onions and garlic. However, instead of forming a bulb, leeks produce a long cylinder of bundled leaf sheaths. The edible parts are the white base and the light green stalk. The darker green ends are usually discarded since they are tougher and have less flavor. Leeks have a mild oniony flavor and can be eaten raw or cooked. (Read more on Wikipedia.)