red onion; cut in slices

The red onion (Allium cepa var. aggregatum) is a cultivar of the common bulb onion characterized by its deep burgundy to purple outer skin and layered flesh that ranges from white to red or purple, depending on the variety and growing conditions. Native to Central Asia and widely cultivated globally, red onions belong to the Amaryllidaceae family and are closely related to yellow and white onions, but possess distinct anthocyanin pigments responsible for their color. Red onions exhibit a sweeter, milder flavor profile compared to yellow onions, with less pungency when raw and a subtle sweetness that becomes more pronounced upon caramelization or roasting. The most common varieties include Red Burgundy, Red Spanish, and Tropea.

Red onions feature a crisp, juicy texture when fresh and develop a tender, almost jammy consistency when cooked for extended periods. Their flavor is moderately sweet with subtle sulfurous notes that are less assertive than those found in yellow onions, making them particularly suited to raw applications.

Red onions are prized both as raw ingredients in salads, ceviches, salsas, and garnishes where their mild sweetness and visual appeal enhance presentation, and as cooked components in braises, curries, and caramelized dishes. They are foundational in Latin American, Mediterranean, and Southeast Asian cuisines, commonly featured in dishes such as pico de gallo, Greek salads, and Vietnamese pickles. Sliced red onions are frequently used for pickling, both quick-pickled and fermented, where their color bleeds into the brine creating visually striking condiments. In stir-fries and grilled preparations, they caramelize beautifully, developing deeper sweetness. Red onions pair well with acidic ingredients such as lime, vinegar, and citrus, which enhance their natural sweetness and provide textural contrast when raw.