med. onion

ProduceYear-round; peak season varies by region but generally summer through fall (June–September in Northern Hemisphere). Stored onions remain available year-round in most markets.

Good source of vitamin C and dietary fiber; contains quercetin and other polyphenolic antioxidants with potential anti-inflammatory properties. Low in calories (approximately 40 per 100g raw).

About

The onion (Allium cepa) is a bulbous plant of the Amaryllidaceae family, native to Central and South Asia and cultivated worldwide for over 5,000 years. The edible bulb consists of concentric layers of modified leaf bases, enclosing a central compressed stem. Medium onions typically weigh 150–250 grams and measure 2.5–3 inches in diameter. The flavor profile ranges from sharp and pungent (due to volatile sulfur compounds) when raw to sweet and caramelized when cooked. Common varieties include yellow (Spanish or Vidalia), red (Purple or Red Creole), and white onions, each with distinct sweetness and pungency levels.

Culinary Uses

Medium onions serve as a foundational aromatic in countless cuisines, forming the base of mirepoix, soffritto, and other flavor foundations. They are diced for soups, stews, and sauces; sliced for caramelization, grilling, and raw salads; and minced for ground meat dishes and salsas. Their dual nature—pungent raw and sweet when cooked—makes them versatile across French, Italian, Spanish, Asian, and Latin American cuisines. Medium onions are preferred in home cooking as they balance ease of peeling and uniform cooking time with sufficient size for varied preparations.

Forms & Preparations

Diced — Cut into uniform 0.25–0.5 inch cubes; standard for soups, stews, sauces, and soffritto bases.
Sliced — Cut into rings or half-moons; used for caramelization, grilling, French onion soup, and raw applications like salads.
Minced — Finely chopped to nearly paste consistency; used in ground meat dishes, salsas, and pâtés for even distribution.
Wedges — Cut into quarters or sixths; used for roasting, grilling, or pickling while maintaining structural integrity.
Caramelized — Slowly cooked over low heat for 45–60 minutes until golden-brown and intensely sweet; topping for burgers and gratinéed dishes.
Pickled — Sliced and preserved in vinegar brine; used as condiment for tacos, ceviche, and charcuterie.

Substitutes

Unknown — Use in equal weight; shallots are milder and more delicate, better for refined dishes. Substitute 1:1 by weight, reducing cooking time slightly.
Unknown — White and light green parts only; use 2–3 scallions per medium onion. Less pungent; add near end of cooking to preserve freshness.
Unknown — White and light green parts only; use 1–2 leeks per medium onion. Milder and sweeter; excellent for creamy soups and braises.
Unknown — Use 3–4 cloves per medium onion for deeper, more savory flavor. Not interchangeable 1:1; garlic is more concentrated and lacks onion's sweetness when cooked.
Unknown — Use equal weight; provides aromatic base with different sweetness profile. Often combined with onions rather than substituted entirely.