Photo by Scot Nelson on Wikimedia Commons (CC0 1.0)

x lg onions

ProduceYear-round, as onions are storage crops; peak harvest is late summer through fall, though onions remain available throughout the year in most markets.

Low in calories (approximately 40 per 100g) with good amounts of vitamin C and quercetin, a flavonoid antioxidant. Onions also contain inulin, a prebiotic fiber supporting digestive health.

About

The onion (Allium cepa) is a bulbous vegetable belonging to the allium family, native to Central Asia and cultivated worldwide for thousands of years. It consists of concentric layers of fleshy leaves wrapped around a central shoot, with papery golden, red, or white outer skin depending on variety. Onions range in flavor from sweet and mild to pungent and sharp, depending on sulfur content and growing conditions; varieties include yellow (Spanish onions), red (Italian reds), and white onions. Raw onions are crisp and assertive; cooking transforms their flavor through caramelization and breaks down sulfur compounds, yielding sweet, mellow characteristics.

Culinary Uses

Onions are fundamental aromatic vegetables in cuisines worldwide, serving as a flavor base in stocks, soups, sauces, and stews across European, Asian, and Latin American cooking. They are grilled, caramelized, pickled, deep-fried, or used raw in salsas and salads. Yellow onions are preferred for cooking due to their balanced sweetness and structure retention; red onions are favored raw for their color and milder bite; white onions are common in Mexican and Asian cuisines. Proper technique—slow cooking for sweetness, high heat for browning—significantly impacts final dish character.

Forms & Preparations

Whole/raw — Unpeeled bulb used for storage, or peeled and used raw in salads, salsas, and garnishes for sharp, crisp flavor.
Diced/chopped — Cut into small, uniform pieces for even cooking and flavor distribution in soups, stews, and sauces.
Sliced — Cut into rings or half-moons for grilling, frying, or use as toppings; used in French onion soup.
Caramelized — Slowly cooked over low heat for 30-45 minutes until deep golden and very sweet; used in gratins, burgers, and sauces.
Pickled — Thinly sliced and preserved in vinegar-based brine; used as condiment and garnish with bright, sharp flavor.
Roasted/grilled — Halved or cut into thick slices, cooked with high heat until caramelized outside and tender inside; served as side dish or component.