onion or gr. onion

The onion (Allium cepa) is a bulbous vegetable belonging to the allium family, native to Central Asia and now cultivated worldwide. It consists of concentric layers of modified leaves surrounding a central bud, with papery outer skin in colors ranging from pale yellow, white, red, or purple depending on variety. The flavor profile ranges from pungent and sharp when raw to sweet and mellow when cooked, with the pungency deriving from volatile sulfur compounds (thiopropanals) released when cell walls are damaged. Common varieties include yellow/Spanish onions (strong flavor, good for storage), white onions (milder, crisp texture), red/purple onions (sweet, slightly fruity notes), and sweet onions like Vidalia or Walla Walla (high sugar content, low sulfur compounds).

Green onions, or scallions (Allium fistulosum), are an immature or non-bulbing variety of onion harvested before significant bulb formation develops. They feature slender white bases and elongated green tops, with a milder, fresher onion flavor compared to mature bulbs. Green onions are often eaten raw and in their entirety, providing both textural contrast and aromatic allium character.

Onions serve as a foundational aromatic vegetable in virtually all world cuisines, providing depth, sweetness, and umami when sautéed as a soffritto, mirepoix, or Holy Trinity base. Raw onions add sharp bite and crunch to salads, salsas, and pickles; caramelized onions become rich and deeply sweet for soups, gratins, and toppings. They appear in French onion soup, Indian curries, Mexican salsas, Asian stir-fries, and countless other dishes. Green onions are used fresh as a garnish, mixed into dips, scattered over soups and rice bowls, or incorporated into egg dishes and pancakes for subtle allium flavor and visual appeal. Both forms are essential in stock-making and braising liquids.