Onion Soup Au Gratin - cooking recipe

Ingredients

1/2 stick butter (4 Tbsp.)
4 to 6 large onions, halved and thinly sliced
1 to 2 Tbsp. sugar
1/2 tsp. coarsely ground pepper
6 c. beef stock or canned beef broth
2 Tbsp. to 1/4 c. red wine
4 large slices French bread, toasted
1 c. grated Gruyere cheese

Preparation

Melt butter in a large soup pot.
Add onions and wilt over medium-low heat, covered, 10 minutes.
Stir occasionally. Sprinkle sugar over onions; toss.
Cook, uncovered, until caramelized, 10 minutes.
Salt and pepper.
Add 3 cups of stock; simmer, uncovered, over medium heat for 15 minutes.
Add remaining 3 cups of stock and wine.
Cook until rich in taste, about 30 to 40 minutes.