Ingredients:
- 2 tablespoons olive oil
- 1/2 cup unsalted butter
- 4 (10.5 ounce) cans beef broth
- 4 cups sliced onions
- 4 cups sliced onions
- 1 teaspoon dried thyme
- 4 slices French bread
- salt and pepper to taste
- 2 slices Swiss cheese, diced
- 4 slices provolone cheese
- 1/4 cup grated Parmesan cheese
Preparation:
Melt the butter with olive oil in a pot on medium heat. Add onions and continually stir until tender and translucent. Do not brown the onions.
Add beef broth, sherry and thyme. Season it with salt and pepper, and simmer for 30 minutes. Heat the oven broiler.
Transfer the soup into bowls and place one slice of bread on top of each. Layer each slice of bread with a slice of provolone, 1/2 slice diced Swiss and 1 tablespoon Parmesan cheese. Place bowls on cookie sheet and broil in the preheated oven until cheese bubbles and browns slightly.
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