The Bermuda have a flat shape and a sweet flavor while the Valencia tend to be larger, elongated, and white, yellow or light brown. Green onions, which are immature bulbs, are sold in bunches as spring onions or scallions and are crisp and tender. A wet or damp neck indicates decay, as do discoloration and mold. Store mature bulbs in a cool, dark, dry, well-ventilated storage area. Open weave bags or baskets are ideal for allowing air circulation.
Mature onions are low in calories and a fair source of vitamin C, vitamin A and calcium.
Green onions, especially the green tops, are better sources of vitamins A and B and potassium. Steam onions to partially precook. Stuff with left-over meat, favorite bread, or rice stuffing. In a casserole dish, layer onions, crumbs, and cheese and then pour sauce over all. Add stock and cook 20 minutes.