Onion Soup - cooking recipe

Ingredients

3 Tbsp. butter
4 c. onion, thinly sliced
1/2 tsp. sugar
1 Tbsp. flour
salt
freshly ground pepper
4 slices French bread, dried or toasted
1/2 c. freshly grated parmesan cheese

Preparation

Melt butter in a large pot, add onions and cook very slowly, about 45 minutes, over low heat, stirring often.
Stir in sugar, flour and cook for 3 minutes.
Add water and simmer partially covered for 30 minutes.
Add salt and pepper to taste.