1 1/2 lbs. or about 5 cups of thinly sliced yellow onions

3 tablespoons of butter

1 tablespoons of olive oil

1 teaspoon of salt

1/4 teaspoons of sugar (helps the onions to brown)

3 tablespoons of all-purpose flour

2 quarts beef stock

1/2 cup of dry white wine

Salt and Pepper to taste

Slices of French Bread

1/2 cup of gruyere, grated