French Onion Soup - cooking recipe

Ingredients

3 Tbsp. butter or margarine
3 large onions
1 Tbsp. flour
1/2 tsp. salt and pepper
5 c. beef broth
4 slices French bread
4 Tbsp. grated Parmesan cheese
8 Tbsp. grated Mozzarella or Monterey Jack cheese

Preparation

In heavy saucepan, melt butter.
Add sliced onions and cook slowly, stirring occasionally, until golden.
Sprinkle on the flour and stir for a few minutes.
Add salt and pepper.
Add broth, stirring constantly.
Bring to a boil; lower heat and simmer, partially covered, for 30 minutes.