Onions are the backbone of savory cooking in nearly every cuisine. They form the flavor base for soups, stews, sauces, and stir-fries, and their character changes dramatically depending on variety and preparation. Understanding onions makes you a better cook.
Yellow onions are the workhorse of the kitchen. They have a strong, pungent flavor raw that mellows into sweetness when cooked. They are the best choice for caramelized onions, French onion soup, and long-cooked stews. Their papery skin and firm flesh hold up well to roasting.
Red onions are sharper and more pungent than yellow, with a beautiful color that makes them ideal for raw use. They are classic in salads, salsas, and pickles. Soaking sliced red onions in cold water for ten minutes takes the edge off while keeping their crunch.
White onions are crisp, clean, and moderately pungent. They are the preferred onion in Mexican and Latin American cooking, where their sharpness balances rich flavors. They are excellent in pico de gallo, on tacos, and in ceviche.
Shallots are milder and more nuanced than onions, with a hint of garlic. They are prized in French and Southeast Asian cooking for vinaigrettes, sauces, and quick sautés. Finely minced shallot in a vinaigrette is a simple luxury.
Scallions (green onions) offer a fresh, mild flavor with both white and green parts usable. The white base can be sautéed like an onion, while the green tops are best added raw or as a garnish. They are essential in Asian cooking and as a topping for soups and salads.
To caramelize onions, slice them thinly and cook in butter or oil over medium-low heat for thirty to forty minutes, stirring occasionally. Add a pinch of salt and a splash of water if they begin to stick. The result is deeply sweet and golden — worth every minute.