½ cup onion
Good source of vitamin C, dietary fiber, and antioxidants, particularly when raw. Contains quercetin and other polyphenols with potential anti-inflammatory properties.
About
The onion (Allium cepa) is a bulbous perennial vegetable native to Central Asia, now cultivated worldwide. The edible portion consists of concentric layers of fleshy leaf bases surrounding a central stem, with papery outer skins ranging from yellow, red, or white depending on variety. Onions are characterized by their pungent aroma and sharp, slightly sweet flavor that mellows considerably when cooked. The sulfur compounds responsible for their distinctive odor and tear-inducing properties become milder and sweeter through caramelization and cooking processes.
Major cultivars include yellow onions (the most common all-purpose variety), red onions (milder and sweeter, excellent raw), white onions (crisp and slightly sharp), and specialty varieties such as Vidalias, Maui, and Walla Walla, which are prized for their natural sweetness.
Culinary Uses
Onions are fundamental aromatics in cuisines worldwide, serving as a base for countless dishes across cultures. They are typically diced and caramelized or sautéed as a flavor foundation for soups, stews, sauces, and braises, where their sugars develop and their sharp edges soften into deep umami sweetness. Raw onions provide textural contrast and pungent bite in salads, salsas, and garnishes, while grilled or roasted onions become tender and sweet. White and yellow varieties are preferred for cooking, while red and sweet varieties are better suited for raw applications or pickling.