each medium onions
Onions are low in calories (40 per 100g) and provide quercetin and other antioxidant flavonoids; they also contain prebiotic fiber (inulin) that supports digestive health.
About
The onion (Allium cepa) is a bulbous perennial vegetable native to central Asia, belonging to the allium family alongside garlic, leeks, and shallots. Medium onions typically weigh between 150–250 grams and feature a papery outer skin that ranges in color from golden-yellow, red, or white depending on variety. The flesh is composed of concentric layers (modified leaf bases) that become increasingly tender toward the center, with a pungent flavor due to sulfurous compounds (thiosulfates) that become notably sweeter when cooked through caramelization. Common medium-sized varieties include Yellow Spanish, Red Burgundy, and White Sweet onions.
Culinary Uses
Medium onions serve as a foundational aromatic vegetable across nearly all world cuisines. They are sautéed as the base layer in mirepoix, soffritto, and similar flavor foundations for soups, stews, and braises; grilled or roasted whole; caramelized for depth of flavor; diced raw for salsas and salads; or pickled for preservation and condiment use. The size makes them practical for many applications—large enough to yield adequate yield when diced, yet small enough to handle whole or halved. Yellow onions are preferred for cooking due to higher sugar content, while red onions hold their color better in raw preparations and white onions offer milder flavor for fresh applications.