Purple onions are a variety of onion with a deep purple outer skin and white inner layers with purple undertones. They are milder and sweeter than other onion varieties, making them ideal for using raw in salads or sauces. Red onions are also rich in antioxidants, especially flavonoids. Additionally, red onions are a good source of vitamin C and fiber. In the kitchen, red onions can be used in a variety of dishes, from salads and sauces to main dishes such as stews, roasts, and stir-fries. Due to their mild and sweet flavor, they are especially popular in Mediterranean cuisine. Red onions can also be used as a decorative ingredient in the presentation of dishes to add a touch of color and flavor.