Tips for Choosing the Perfect Onion for Every Recipe 1 White Onion With a mild, slightly sweet flavor, its perfect for using raw in salsas or quick sautés. 2 Red Onion Its mild taste makes it ideal for guacamole, pickling, and adding vibrant color to salads. 3 Yellow Onion Known for its richer, deeper flavor, its great for cooking, especially in soups, sauces, and roasts. 4 Sweet Onion With its naturally sweet taste, its excellent for frying or roasting alongside other vegetables. 5 Green Onions Fresh and crunchy, they make a great garnish for raw dishes and are also delicious when grilled or roasted. 6 Shallots With a delicate flavor, theyre perfect for sauces, dressings, and as an elegant garnish for various dishes.