Onion Soup Gratin

3 tablespoons butter
4 onions, thinly sliced
2 tablespoons granulated sugar
4 cups beef broth
1 tablespoon balsamic vinegar
1/2 teaspoon salt
1/4 teaspoon ground black pepper
4 slices of French bread, toasted
1 cup shredded Swiss cheese

In a large soup pot over medium heat, melt the butter. Add onions, cover, and slowly cook until soft and translucent, stirring occasionally, about 15 minutes. Add sugar and continue to cook until caramelized and rich brown in color, about 10 more minutes. Stir in broth, vinegar, salt and pepper to taste. Simmer, covered, for 20 minutes.

Heat broiler. Ladle soup into oven proof bowls. Top each with a piece of toasted bread and 1/4 of the cheese. Broil until cheese is melted and golden.

Serve hot.

Makes 4 servings.

Porcelain Ceramic Onion Soup Crock Bowl, Small 10 Ounce, Set of 4

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