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:
- In a large pot, melt the butter with olive oil over medium heat.
- Add the sliced onions and cook slowly, stirring often, for 30–40 minutes until deeply golden and caramelized. Add sugar if needed.
- Stir in the garlic and cook for 1 minute.
- Deglaze the pot with white wine and let it reduce for 2–3 minutes.
- Add the broth, bay leaf, thyme, salt, and pepper. Simmer for 20 minutes.
- Remove the bay leaf. Taste and adjust seasoning.
- Ladle the soup into oven-safe bowls. Place toasted baguette slices on top and cover with grated cheese.
- Broil for 3–5 minutes until the cheese is melted, bubbly, and golden brown.
Serve hot and enjoy this rich, comforting French classic! 🧅