French onion soup is served in oven-proof crocks or bowls. The final step in preparing this soup involves ladling it into this type of bowl and finishing it in the oven.
Traditionally, French onion soup is cooked on the stove and ladled into oven-safe bowls. It is then topped with cheese and a slice of bread, usually a baguette, and put under the broiler until the cheese is bubbly. After removing the bowls from the oven, they should be allowed to cool until the soup is not too hot to serve. Then, it can be served in the same bowls.