Ingredients:
- 2 large yellow onions, thinly sliced
- 4 tablespoons unsalted butter
- 2 cloves garlic, minced
- 2 tablespoons flour
- 6 cups beef broth
- 1 cup dry white wine
- 2 bay leaves
- Salt and freshly ground black pepper, to taste
- 8 thin slices of French bread, toasted
- 2 cups grated Gruyère cheese
