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Some people use the name spring onion as a synonym for green onion, while others use it to refer to a green onion with a partially formed bulb.

These are onions that have small bulbs and long green stalks. They're usually eaten raw, but you can also grill or sauté them. Some people also use the term green onions to refer to onion tops, shallot tops and young leeks.

These onions are mild and crisp, so they're the onions of choice for slicing raw on burgers and sandwiches. They can be lightly cooked, too, though they're not as pungent and flavorful as storage onions. There are several different varieties, often named after the region in which they're grown. The most popular include Vidalia, Walla Walla, Sweet Imperial, Texas Spring Sweet, Texas 1015Y, Carzalia Sweet, Oso Sweet, Arizona, Granex, and Maui. They're usually available from March through August, though some producers extend the season by storing them in a low-oxygen environment. Sweet onions are usually larger than storage onions. They also have a higher water content, so they don't keep as well.