Ingredients:
4 large onions, thinly sliced
3 tablespoons butter
1 tablespoon olive oil
1 teaspoon sugar (optional, for deeper caramelization)
2 cloves garlic, minced
6 cups beef broth (or vegetable broth)
½ cup dry white wine (optional)
1 teaspoon salt (adjust to taste)
½ teaspoon black pepper
1 bay leaf
1 teaspoon fresh thyme (or ½ teaspoon dried)
Baguette slices, toasted
1½ cups grated Gruyère cheese (or Swiss cheese)
Instructions:
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