Photo by Scot Nelson on Wikimedia Commons (CC0 1.0)

½ cup chopped white or yellow onion

ProduceYear-round. Both white and yellow onions are excellent keepers; harvest occurs in late summer and early fall, but properly cured bulbs remain available throughout the year via cold storage.

Onions are a good source of vitamin C, dietary fiber, and quercetin, a flavonoid with antioxidant and anti-inflammatory properties. They are very low in calories (approximately 44 calories per cup chopped, raw) and contain compounds associated with cardiovascular and bone health.

About

The onion (Allium cepa) is a bulbous vegetable belonging to the lily family, native to Central Asia and widely cultivated worldwide. White and yellow onions are varieties distinguished primarily by papery skin color and minor flavor variations; yellow onions have a slightly higher sugar content and deeper flavor due to longer storage and curing. Both possess a characteristic layered structure of concentric fleshy scales wrapped in thin, papery outer layers. Raw onions deliver a pungent, sulfurous bite owing to volatile compounds (thiopropanol sulfoxides) that transform into mild, sweet flavors when heated through caramelization and the breakdown of sulfur compounds. Yellow onions are among the most versatile culinary onions, offering balanced sweetness and pungency, while white onions tend toward a sharper, more assertive onion flavor with slightly less residual sweetness.

Culinary Uses

Onions serve as a foundational aromatic in countless cuisines, functioning as a flavor base for soups, stocks, braises, and sauces across European, Latin American, Asian, and Middle Eastern traditions. Chopped onions are typically sautéed with oil or butter in the early stages of cooking to build depth and complexity; they caramelize into deep sweetness over extended heat, or soften quickly into translucency for lighter dishes. Beyond cooked applications, raw chopped onions appear in salsas, salads, ceviche, and as garnishes. White onions are often preferred for raw preparations and Mexican cuisine, while yellow onions dominate French mirepoix and general all-purpose cooking due to their balance of flavor and ability to brown evenly.

Forms & Preparations

Chopped — Cut into small, roughly uniform cubes (approximately ¼-inch), as specified. The standard preparation for sautéing and incorporation into soups, stews, and sauces.
Diced fine — Cut into smaller, more uniform pieces (approximately ⅛-inch). Used in finer preparations, garnishes, and raw applications where texture and appearance matter.
Sliced — Cut crosswise into thin rings or half-rings. Common for caramelizing, French onion soup, and stir-fries.
Minced — Cut as finely as possible, nearly to a paste. Used to distribute onion flavor evenly throughout dishes or in raw condiments like salsas.
Whole/quartered — Left whole or cut into quarters for long braises, stocks, and roasting where the onion structure holds intact during cooking.
Caramelized — Slowly cooked in fat over low to medium heat for 30-45 minutes until deep golden-brown, developing intense sweetness. Used as a garnish, condiment, or component in French onion soup.