red and 1 small white onion

Red onions (Allium cepa var. atropurpurea) are bulbous vegetables belonging to the amaryllis family, characterized by papery outer skins and concentric layers of pungent, sweet flesh ranging from pale to deep purple-red. The red pigmentation derives from anthocyanin antioxidants. Red onions originate from Central Asia and are now cultivated worldwide. They possess a sharper, slightly more peppery bite than yellow onions when raw, which mellows considerably with cooking, developing a rich, caramelized sweetness. The flavor compounds in onions are volatile sulfur compounds that intensify when the cell walls are damaged through cutting.

White onions (Allium cepa) share the same species as red and yellow varieties but differ in pigmentation and flavor profile. White onions feature pale, papery outer layers and white to pale yellow flesh, offering a milder, more delicate flavor than red onions with less astringency. Originated in Central Asia, white onions are particularly prevalent in Latin American and Asian cuisines. They are smaller and more tender than storage onions, with a sweeter profile that makes them suitable for both raw and cooked preparations.

Red onions are employed across global cuisines both raw and cooked. Raw, they add peppery crunch and visual appeal to salads, salsas, ceviche, and pickled preparations; their purple hue intensifies when acidulated. When caramelized or slow-cooked, red onions develop deep sweetness and are essential to French onion soup, Indian curries, and Mediterranean braises. White onions, milder and more delicate, are traditionally used in Latin American salsas, Asian stir-fries, and as a soffritto base. Both are fundamental aromatics in mirepoix, soffritto, and holy trinity preparations. They pair well with vinegars, citrus, and assertive spices. Grilling or roasting whole onions yields tender, sweet results suitable for side dishes or garnishes.