Photo by Scot Nelson on Wikimedia Commons (CC0 1.0)

onion - peeled

ProduceOnions are available year-round due to their excellent storage capacity, though fresh spring onions peak in late spring; storage onions (yellow and red varieties) are harvested in late summer and remain available through winter and spring.

Onions are a good source of vitamin C, dietary fiber, and antioxidants including quercetin; they also provide prebiotic inulin, which supports digestive health.

About

The onion (Allium cepa) is a bulbous vegetable belonging to the Amaryllidaceae family, native to Central Asia and cultivated worldwide for over 5,000 years. The bulb consists of concentric layers of fleshy, starch-rich scales surrounding a central stem, enclosed in a papery outer skin. Peeled onions have had this protective skin removed, exposing the pale, translucent flesh beneath. Common varieties include yellow (or Spanish) onions with assertive flavor, sweet onions such as Vidalia or Walla Walla with higher sugar content and milder taste, red (purple) onions with fruity undertones, and white onions with delicate, slightly sharp characteristics. The flavor of onions is determined by volatile sulfur compounds, particularly pyruvic acid, which are activated when cell walls are damaged through cutting or cooking.

Culinary Uses

Peeled onions serve as an aromatic foundation in countless cuisines, functioning as one of the holy trinity of vegetables in French cooking (alongside carrots and celery) and the soffritto base in Italian cuisine. They are diced for mirepoix, sliced thin for caramelization into sweet, jamlike condiments, or minced for raw applications in salsas and relishes. Onions are essential in stocks, braises, stir-fries, soups, and stews, where gentle cooking mellows their pungency and develops sweet, complex flavors. Raw peeled onions appear in salads, sandwiches, and ceviche, where their sharp bite provides contrast. The choice of variety—sweet for caramelizing, red for color and mild flavor in raw applications, yellow for general cooking—affects the final dish.

Forms & Preparations

Diced — Cut into uniform cubes (typically ¼-inch), used as an aromatic base for sauces, soups, and stews.
Sliced — Cut into rings or half-moons of varying thickness, ideal for caramelizing, grilling, or roasting.
Minced — Finely chopped into small pieces, used raw in salsas, relishes, and chutneys, or cooked into sauces.
Julienned — Cut into thin, matchstick-like strips for stir-fries, salads, and dishes requiring quick cooking.
Wedged — Cut into quarter or eighth sections, useful for roasting, grilling, and braising whole.
Powder — Dehydrated and ground into fine powder, used as a seasoning in spice blends and dry rubs.