onion<br />
Low in calories and rich in vitamin C, fiber, and polyphenolic antioxidants. Contains organosulfur compounds (thiosulfates) with potential anti-inflammatory properties.
About
The onion (Allium cepa) is a bulbous flowering plant in the amaryllis family, native to northwestern South Asia and cultivated worldwide for thousands of years. The edible portion is the bulb, composed of concentric layers of modified leaves that store carbohydrates and sulfur compounds responsible for the characteristic pungent flavor and aroma. Common varieties include yellow (golden), red (purple), and white onions, each differing in sweetness, intensity, and color pigmentation. Cooking transforms onions through caramelization, converting sulfur compounds and sugars to develop deep, complex sweetness and umami notes, while raw onions retain sharp, acrid, and slightly sweet qualities.
Culinary Uses
Onions are a foundational aromatic in virtually every culinary tradition, forming the flavor base for stocks, soups, stews, and sauces across European, Asian, and Middle Eastern cuisines. Yellow onions are the workhorse of cooking; red onions suit raw applications and pickling due to their mild sweetness and vibrant color; white onions are preferred in Mexican and Asian cuisines. Onions are employed at every cooking stage—sweated to develop mellow sweetness, caramelized for depth and umami, roasted whole for creaminess, grilled for char, or served raw in salads, salsas, and relishes. They pair with virtually all savory ingredients and are essential to mirepoix, soffritto, and holy trinity preparations.