White onions, also known as Spanish onions, are a popular variety of onion with a mild and sweet flavor. When raw, they add a mild onion flavor and a crisp texture to salads, salsas, and sandwiches. They are commonly used in Mexican cuisine for dishes like pico de gallo and guacamole. When cooked, white onions become sweeter and mellow in flavor, making them a great addition to soups, stews, stir-fries, and sautés. They can be caramelized to enhance their natural sweetness and used as a topping for burgers, sandwiches, and pizzas.