French Onion Soup - cooking recipe

Ingredients

1/4 c. butter
1 1/2 lb. onions, thinly sliced
4 c. canned beef broth
1 tsp. Worcestershire sauce
4 slices French bread, dried until crisp in 250~ oven for 30 minutes
Mozzarella cheese slices

Preparation

Heat butter in large heavy saucepan.
Add onions and cover; cook over low heat 20 minutes.
Stir in broth and Worcestershire sauce.
Simmer for 1/2 hour.
Place bowls on cookie sheet; put chunks of bread in each bowl and pour in soup.
Top with cheese slices.
Place under broiler about 4 minutes or until cheese lightly browns.