red onion -- dice fine
Red onions are a rich source of antioxidant anthocyanins and quercetin, supporting anti-inflammatory health benefits. They also provide dietary fiber, vitamin C, and manganese with minimal calories (45 per 100g raw).
About
The red onion (Allium cepa var. atropurpurea) is a bulbous vegetable characterized by deep purplish-red papery outer layers and concentric rings of red-tinged white flesh. Native to Central Asia and cultivated for millennia across Mediterranean and Asian cuisines, red onions are sweeter and milder than yellow or white varieties, with a slightly fruity undertone and crisp, juicy texture when raw. The distinctive anthocyanin pigments responsible for their color are water-soluble flavonoid compounds that diminish with cooking, causing the onion to fade toward brown or gray. Major cultivars include Red Burgundy, Red Spanish, and Italian Red.
Red onions thrive in temperate climates and range from small torpedo-shaped varieties to large, flat-bottomed globe types. When sliced thinly or diced fine, they retain their peppery bite and vibrant color, making them particularly prized for raw applications.
Culinary Uses
Red onions are fundamental to raw preparations—salads, salsas, ceviche, and pickled applications—where their sweetness, color, and crisp texture shine. They are diced fine for even distribution in fresh salsas, pico de gallo, and vinaigrettes, adding a peppery backdrop without overwhelming other ingredients. Finely diced red onions are also essential in Mediterranean mezze platters, Indian chutneys, and Southeast Asian sambals. Though less common in cooked applications than yellow onions due to their watery nature and color loss, they can be briefly sautéed or roasted to mellow their sharpness. Pickling red onions in vinegar, salt, and spices is a traditional preservation method across Latin American, Middle Eastern, and Scandinavian cuisines.