A liliaceous plant of the genus Allium (Allium cepa), having a strong-flavored bulb and long hollow leaves; also, its bulbous root, much used as an article of food. The name is often extended to other species of the genus.
Related to the lily, this underground bulb is prized around the world for the magic it makes in a multitude of dishes with its pungent flavor and odor. There are two main classifications of onion - green onions (also called scallions) and dry onions, which are simply mature onions with a juicy flesh covered with dry, papery skin. Dry onions come in a wide range of sizes, shapes and flavors.