c. onion
Onions are a good source of vitamin C, dietary fiber, and quercetin, a flavonoid with antioxidant properties. They contain negligible amounts of fat and protein relative to carbohydrate content.
About
The onion (Allium cepa) is a bulbous plant of the Amaryllidaceae family, native to Central Asia and widely cultivated across temperate and subtropical regions worldwide. The edible bulb consists of concentric layers of fleshy leaf bases enclosed in papery outer skins, ranging in color from white and pale gold to deep red or purple depending on variety. The characteristic pungent aroma and sharp, slightly sweet taste result from volatile sulfur compounds that develop when cell structures are damaged. Major cultivars include yellow Spanish onions, white onions, red/purple onions, and sweet varieties such as Vidalia and Walla Walla.
Culinary Uses
Onions serve as a foundational aromatics ingredient in virtually every savory cuisine, providing both flavor and textural depth when raw, caramelized, grilled, roasted, or pickled. They function as a base for stocks, soups, stews, and sauces across European, Asian, and Latin American traditions. Raw onions appear in salsas, salads, and ceviche; cooked onions feature in French onion soup, Indian curries, stir-fries, and caramelized preparations. The vegetable's flavor profile transforms dramatically with cooking—sharp and pungent when raw, progressively sweeter and mellow as prolonged heat breaks down sulfur compounds and caramelizes natural sugars.