A tasty allium with a long history of cultivation. The Roman emperor Nero listed leeks among his favorite foods and believed that they gave him a good singing voice. More recently, the leek has become a national symbol of Wales, with the Welsh enthusiastically integrating it into many of their dishes. A little less robust than an onion in flavor, leeks are used in stocks, soups, braised dishes, or caramenlized for a gourmet addition to pizza and quiche. Nutrients: vitamins A, K, C, B6, and iron.