Scallions, also known as green onions or spring onions, are edible vegetables belonging to various species in the genus Allium , which also includes onions, garlic, leeks, shallots, and chives

. They are characterized by a white base that has not fully developed into a bulb and long, slender green stalks that are hollow and tubular

. The entire scallion plant is edible, with the white part having a sharper, more onion-like flavor and the green part offering a milder, slightly sweet, and grassy taste

. Scallions are harvested early before the bulb fully forms, which distinguishes them from regular onions that develop a full bulb

. Culinarily, scallions are versatile and can be eaten raw or cooked, commonly used in salads, salsas, soups, stir-fries, and as garnishes to add a mild onion flavor without overpowering dishes

. They are available year-round but peak in spring and summer

. In summary, scallions are young onions with a mild taste, featuring a small white base and long green stalks, used widely in cooking for their flavor and texture