Yellow onions are encased in a light-yellow to copper papery skin, while the inner flesh is white. They are crunchy, with a pungent flavor when raw. If cooked, yellow onions develop a milder flavor, that is both nutty and sweet. Yellow onions are a good source of vitamin C.
Yellow onions can be sauteed, braised, caramelized, grilled or dry-roasted. They are used to add flavor to broths, soups and stews. The bulbs will keep for 1-2 months if stored in a cool, dry and dark place with good air circulation.
Onions, or Alium cepa L, are vegetables of the genus Allium There are many varieties, ranging in pungency, shape and color (red, yellow and white). Mature onion bulbs are the most commonly eaten, although onions can be consumed at any stage. Onions are available fresh, frozen, pickled, dried and powdered. Onions contain low amounts of essential nutrients.
Onions are toxic to many animals, like dogs and cats (ref).