onion - thinly sliced
Onions are a good source of vitamin C, fiber, and quercetin (a flavonoid antioxidant). They are very low in calories and contribute negligible fat or protein.
About
The onion (Allium cepa) is a bulbous perennial plant of the amaryllis family, native to Central Asia and now cultivated worldwide. The edible bulb comprises concentric layers of fleshy leaves with a papery outer skin that may be yellow, red, white, or purple depending on variety. Onions are characterized by a pungent aroma and sharp, slightly sweet flavor when raw, which becomes mellow and caramelized when cooked. The pungency derives from volatile sulfur compounds (particularly thiols and disulfides) released when cell walls are damaged during cutting. Major cultivars include yellow, white, and red onions, each with distinct flavor profiles and applications.
Culinary Uses
Thinly sliced onions serve as a foundational ingredient in virtually all global cuisines, employed both raw and cooked. Raw, they provide sharp bite and crisp texture to salads, sandwiches, ceviche, and pickled preparations. When cooked, particularly through caramelization or sautéing, sliced onions develop deep sweetness and become a flavor base (soffritto in Italian cuisine, mirepoix in French) for stocks, soups, stews, and sauces. They are essential to dishes such as French onion soup, creamed onions, and stir-fries. Thinly sliced onions also appear as garnishes, in relishes, and in applications requiring rapid cooking or even browning.