Photo by Scot Nelson on Wikimedia Commons (CC0 1.0)

– 2 medium onions

ProduceYear-round availability due to excellent storage properties; peak harvest in late summer and early fall (August–October in Northern Hemisphere). Stored onions remain viable for months in cool, dry conditions.

Low in calories with notable amounts of vitamin C, fiber, and quercetin (a flavonoid antioxidant). Contain prebiotic compounds that support gut 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, modified leaves wrapped around a central shoot, with a papery outer skin that ranges in color from golden yellow to white, red, or purple depending on variety. The flavor profile is pungent and acrid when raw, becoming sweet and mellow when cooked due to the caramelization of natural sugars. Major varieties include yellow onions (versatile, pungent), white onions (milder, crisp), red onions (sweet, colored), and specialty cultivars such as Vidalia and Walla Walla known for heightened sweetness.

Culinary Uses

Onions serve as a foundational aromatic in cuisines worldwide, most commonly used as a sautéed base (soffritto, mirepoix, or holy trinity) for soups, stews, braises, and sauces. They are grilled, caramelized for depth, pickled for acidity, or consumed raw in slaws and salads. Yellow onions are the workhorse for cooking applications; red onions are preferred raw or lightly cooked to preserve color; white onions suit Mexican and Asian cuisines. Proper knife technique—either brunoise, dice, or slice—and understanding the cooking time needed (10 minutes for softening, 30+ for caramelization) are essential to controlling the final flavor contribution.

Forms & Preparations

Diced — Cut into uniform cubes, typically ¼-inch for cooking applications; standard for soffritto and aromatic bases.
Sliced — Cut into thin half-moons or rings; used for caramelizing, grilling, pickling, or raw salads.
Minced — Finely chopped to near paste consistency; incorporates quickly into dishes and used in patties, stuffings, and sauces.
Caramelized — Slowly cooked over low heat for 30–45 minutes until deep golden brown and intensely sweet; used in soups, tarts, and sauces.
Whole (roasted or braised) — Halved or left intact, roasted or braised until tender; served as a side dish or incorporated into composed plates.
Powder or Dehydrated — Dried and ground into seasoning powder; used in spice blends, dry rubs, and instant flavor for dishes where fresh onion texture is not desired.