Baked French Onion Soup - cooking recipe

Ingredients

3 to 4 large onions, sliced
1/3 to 1/2 c. butter
2 cans beef broth
2 cans water
1 Tbsp. Worcestershire sauce
6 (1-inch) slices French bread, toasted
1 slice each: Swiss cheese and Mozzarella cheese
Parmesan cheese, grated

Preparation

Simmer onions in butter for 30 minutes, covered.
Add broth, water and Worcestershire sauce.
Simmer 30 minutes longer.