What is a common garnish for a French onion soup?

A common garnish for French onion soup is Gruyère cheese and crusty bread, which completes the dish both visually and texturally. French onion soup is typically topped with a layer of Gruyère cheese that melts beautifully when baked, creating a rich and creamy layer over the soup. The crusty bread serves as a base for the cheese while also providing a satisfying crunch that contrasts with the soft, savory onions and broth. This combination is essential to traditional French onion soup as it enhances its flavor profile, delivering a comforting and indulgent experience when served hot.

While parsley, sour cream, and chopped chives can be used in various culinary dishes, they are not traditional garnishes for French onion soup. The specific use of cheese and bread elevates the soup to a classic French dish, making it distinct and memorable.