Brown onions, also known as yellow onions, are a versatile cooking onion with a golden-brown skin and a pungent, savory flavor. They're one of the most commonly used onions in culinary applications. Brown onions are ideal for sautéing, caramelizing, or roasting, as their strong flavor mellows and sweetens when cooked. They're used as a base ingredient in a wide range of dishes, including soups, stews, sauces, stir-fries, and casseroles.