What type of soup is the French Onion Soup primarily made from?

The French Onion Soup is primarily made from onions, which are the key ingredient that defines the dish. In this classic soup, onions are slowly caramelized to develop their natural sweetness, which contributes to the rich, deep flavor profile that characterizes French Onion Soup. The caramelization process adds a layer of complexity to the soup, allowing it to stand out uniquely among various types of soups. While broth and cheese are also important components of the dish, the focus on onions is what makes this soup distinct and gives it its signature taste. The other ingredients listed, like tomatoes, broccoli, and clams, are not traditional components of French Onion Soup and do not contribute to its authentic flavor.