½ thinly sliced onion
Onions are low in calories but provide vitamin C, B vitamins, and fiber. They contain sulfur compounds and quercetin (a flavonoid) with reported anti-inflammatory and antioxidant properties.
About
The onion (Allium cepa) is a bulbous perennial plant in the Amaryllidaceae family, native to Central Asia and now cultivated worldwide. The edible bulb consists of concentric layers of leaf bases that have become modified into fleshy, starch-filled scales surrounding a central shoot. Onions vary considerably in color—white, yellow, and red varieties are most common—and in pungency, depending on cultivar and sulfur content of soil. The characteristic sharp, peppery flavor comes from volatile sulfur compounds; heat transforms these compounds into sweet-tasting sugars, creating the caramelized depth of cooked onions.
Culinary Uses
Onions are a foundational aromatic in global cuisines, used raw, caramelized, grilled, pickled, and fried. Raw thinly sliced onions add crunch and bite to salads, tacos, sandwiches, and ceviche; they are often softened in acid (vinegar or citrus) to mellow their sharpness. When cooked slowly, onions sweeten dramatically and form the base of soups, stews, sauces, and many sautéed dishes. Caramelized onions bring umami depth to French onion soup and burgers. Different varieties suit different applications: yellow onions are versatile cooking onions; sweet varieties like Vidalia suit raw applications; red onions provide color and slightly milder flavor.