onion — chopped

The onion (Allium cepa) is a bulbous vegetable belonging to the Amaryllidaceae family, native to Central Asia and now cultivated worldwide. The edible portion is the layered bulb composed of modified leaf bases filled with sugars and volatile sulfur compounds. Onions vary in color (yellow, white, red/purple), size, and pungency depending on variety and growing conditions. Yellow onions, the most common cooking variety, have a papery tan skin and creamy interior with a sharp, sulfurous bite that mellows considerably when cooked. Red onions are milder and sweeter, while white onions are typically the most pungent. When cut or heated, onions release volatile compounds (particularly pyruvic acid and thiopropionaldehyde) responsible for their characteristic smell and tear-inducing properties.

Chopped onions serve as a foundational aromatic in countless cuisines, forming the base of French mirepoix, Spanish sofrito, and Creole holy trinity preparations. They are sautéed to develop sweetness and depth in soups, stews, braises, and sauces; caramelized for French onion soup and glazes; raw in salads, salsas, and pickled preparations; and grilled or roasted whole or in wedges as a side dish. Chopped onions work across virtually all savory cooking and many sweet applications (caramelized onion desserts exist in some cuisines). Their flavor intensity ranges from sharp and raw to sweet and mellow depending on cooking method and duration.