Red onions feature firm, purple-tinged skins and layers with a mild, slightly sweet flavor. They are versatile in the kitchen—excellent raw in salads, pickles, and salsas or roasted, grilled, and caramelized to complement meats, sandwiches, and roasted vegetables. Store in a cool, dry place away from sunlight to extend shelf life. Choose bulbs that are firm with dry skins; avoid soft spots or sprouts.