French Onion Soup - cooking recipe

Ingredients

4 Tbsp. butter
6 yellow onions
2 cans beef broth
1 1/2 c. sherry
6 slices (1/2-inch thick) French bread, toasted
3/4 c. Parmesan cheese
6 slices Swiss cheese

Preparation

In skillet, melt butter and saute onions until browned.
Add broth and sherry and simmer on low for 2 1/2 hours.
Spoon soup into heatproof mugs; top with toasted bread.
Sprinkle with Parmesan cheese and top with slice of Swiss cheese.
Broil until cheese melts.