A common vegetable used in French cooking is the onion. Onions are a fundamental ingredient in many traditional French dishes, including French onion soup, coq au vin, and various sauces. They add depth of flavor and sweetness when caramelized, enhancing the overall taste of a dish. Onions come in several varieties, such as yellow, white, and red, each bringing unique characteristics to cooking. In addition to their flavor, onions also offer health benefits, being rich in vitamins and antioxidants. Their versatility makes them a staple in not only French cuisine but also many other culinary traditions around the world.