Photo by Scot Nelson on Wikimedia Commons (CC0 1.0)

*onion

ProduceFresh onions peak from late spring through fall, with harvest varying by region and variety; yellow and storage onions remain available year-round through proper curing and cold storage, making onions effectively a year-round staple ingredient.

Onions are low in calories and a good source of vitamin C, manganese, and dietary fiber; they also contain quercetin and other polyphenolic compounds with antioxidant and anti-inflammatory properties.

About

The onion (Allium cepa) is a bulbous vegetable belonging to the allium family, native to western Asia and cultivated globally for millennia. The edible portion is the underground bulb, composed of fleshy, concentric layers (modified leaf bases) enclosed in a papery outer skin that ranges from white, yellow, or red depending on variety. The flavor profile spans from pungent and sharp when raw to sweet and mellow when cooked, owing to the volatile sulfur compounds (thiols and disulfides) that develop during growth and transform through heat application. Major cultivars include yellow onions (all-purpose, balanced flavor), sweet onions like Vidalia and Walla Walla (high sugar content, mild pungency), red onions (anthocyanin-rich, slightly sweet), and pearl onions (small, tender, used whole).

Culinary Uses

Onions serve as a foundational aromatic in cuisines worldwide, functioning as a flavor base in stocks, soups, stews, and sauce preparations across European, Asian, Latin American, and Middle Eastern traditions. They are employed raw in salads and salsas for sharp bite, caramelized for depth and sweetness in French onion soup and gratins, and pickled for preserved acidity and crunch. Grilled or roasted whole onions accompany main courses, while minced onions are essential to ground meat preparations and stuffing. The cooking method fundamentally alters their character: brief cooking renders them translucent and mildly sweet, extended low-heat cooking caramelizes sugars into deep umami notes, and raw consumption maximizes their pungent sulfur presence.

Forms & Preparations

Whole/Raw — Unpeeled or peeled bulbs used raw in salads, sliced for sandwiches, or minced for salsas and relishes; delivers sharp, pungent flavor.
Diced — Cut into small uniform cubes and used as an aromatic base for soups, stews, sauces, and braises; standard mirepoix component.
Sliced — Cut into rings or half-moons and used raw in salads and pickles, or cooked for caramelization, gratins, and French onion soup.
Minced — Finely chopped into small pieces, incorporated into ground meat mixtures, spice pastes, and raw condiments for distributed flavor and texture.
Caramelized — Long-cooked in fat over low heat until deep brown and sweet; concentrated umami flavor used in soups, tarts, burgers, and compound butters.
Roasted/Grilled — Whole bulbs roasted until soft and sweet or halved and grilled with char; served as a side dish or incorporated into purées and dips.