red onion halved and thinly sliced
Red onions are a good source of dietary fiber, vitamin C, and quercetin, a polyphenolic antioxidant concentrated in the colored layers. They are low in calories and contain compounds associated with anti-inflammatory properties.
About
Red onion (Allium cepa var. purpurea) is a cultivar of the common bulbous onion characterized by its deep purple-red papery exterior and layered interior with burgundy-tinged white flesh. Native to temperate regions and cultivated worldwide, red onions contain anthocyanin pigments responsible for their distinctive coloration, which intensifies with exposure to soil minerals and acidity. The flavor profile is notably sweeter and milder than yellow onions, with a crisp, juicy texture when raw and a tendency to become tender and slightly sweetish when cooked.
Popular varieties include Walla Walla, Red Burgundy, and Italian Red. Red onions display regional flavor variations depending on growing conditions—volcanic soils often enhance mineral notes, while cooler climates tend to produce sweeter bulbs.
Culinary Uses
Red onions, when thinly sliced and halved, are most valued for raw applications where their mild sweetness, crisp texture, and striking visual appeal are best showcased. They feature prominently in salads, salsas, pickled preparations, and as garnishes for tacos, burgers, and grain bowls. The thin slicing increases surface area for quick absorption of dressings and marinades. In raw form, they pair well with acidic components like citrus and vinegars, which soften their pungency. While equally edible when cooked—becoming sweeter and more tender—sliced red onions are less commonly employed for caramelizing or deep cooking compared to yellow onions, as cooking diminishes their vibrant color and signature mild flavor.