White onions, also known as Spanish onions, are a variety of onion known for their mild flavor and crunchy texture. They have a white or pale yellow skin and translucent white flesh. Compared to yellow onions, white onions have a milder taste and a higher water content, making them perfect for raw applications such as salads, sandwiches, and salsas. However, they can also be cooked and used as a flavor base in various dishes, including soups, sauces, stir-fries, and sautés. White onions are versatile and add a subtle onion flavor without overpowering other ingredients.