French Onion Soup - cooking recipe

Ingredients

1 stick butter
6 to 8 onions, sliced
1 big Tbsp. Dijon mustard
2 Tbsp. flour
10 to 12 bouillon cubes
8 c. water
croutons (2 per bowl)
Mozzarella cheese, slices
Parmesan cheese

Preparation

Melt butter.
Add onions and cook until transparent, slowly. Add Dijon mustard and flour.
Stir.
Put in 8 cups of bouillon, already dissolved.
Simmer 20 minutes.
Meanwhile, toast croutons and dry out.
Pour soup into crocks, place croutons on top, then slice of Mozzarella cheese, then sprinkle a little Parmesan cheese on top.
Broil until cheese melts.
Serve hot!!!