Rich Onion Soup - cooking recipe

Ingredients

2 lb. onions, sliced
6 Tbsp. butter
2 Tbsp. corn oil
1/2 tsp. sugar
1/2 tsp. dry mustard
3 Tbsp. flour
2 qt. beef broth
1 1/2 c. dry white wine
salt and pepper to taste
French bread, sliced and toasted
Gruyere cheese, sliced
Parmesan cheese

Preparation

In a large kettle, cook onions in butter and oil over low heat for 30 minutes, stirring occasionally.
Add sugar and mustard. Cook 30 minutes longer.
Blend in flour.
Stir in broth and wine and cook 30 minutes more.
Season to taste.