Ingredients:
- 4 large onions, thinly sliced
- 4 tablespoons unsalted butter
- 2 tablespoons olive oil
- 2 cloves garlic, minced
- 1 teaspoon granulated sugar
- 1/2 cup dry white wine (optional)
- 6 cups beef broth
- 1 teaspoon Worcestershire sauce
- Salt and pepper to taste
- Baguette slices, toasted
- Gruyère cheese, grated
- Fresh thyme or parsley for garnish (optional)
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