onion (about 6 ounces

The onion (Allium cepa) is a bulbous flowering plant of the amaryllis family, native to Central Asia and cultivated globally as a fundamental culinary vegetable. The bulb consists of concentric layers of fleshy leaf bases that overlap to form the characteristic globe or ovoid shape. Common varieties include yellow onions (the most versatile cooking onion), red or purple onions (sweeter, with anthocyanin pigments), and white onions (milder flavor, popular in Latin American cuisine). Onions contain sulfur compounds that provide their pungent aroma and bite, which are modified by cooking—prolonged heating converts these compounds into sweet, caramelized sugars, fundamentally transforming the flavor profile. Raw onions are sharp and acidic, while cooked onions become progressively sweeter and more mellow.

Onions serve as an aromatic base in countless savory dishes across world cuisines, providing foundational umami depth when sautéed or caramelized. They appear raw in salads, salsas, and relishes for crispness and pungency; sliced thin and pickled for acidity and preservation; and grilled or roasted whole for sweetness. Yellow onions are the workhorse for stocks, soups, stews, and mirepoix (aromatic base); red onions are preferred for raw applications due to their milder sweetness; white onions dominate Latin American cuisines. Slow caramelization (30-45 minutes) develops natural sugars and umami, essential for French onion soup and reduced sauces. Onions pair with garlic, thyme, and beef in classical preparations, and with cumin, coriander, and turmeric in Indian cooking.