Ingredients
The following ingredients have 7 Servings
- 6 medium yellow onions (thinly sliced)
- 4 tablespoons butter
- 1/2 teaspoon salt
- 2 tablespoons olive oil
- 1 clove garlic (minced)
- 8 cups beef stock or broth ((64-ounces))
- 1/2 cup chicken stock or broth
- 8 slices French bread (toasted)
- 2 cups Gruyere cheese (grated)
- 1/2 cup Parmesan cheese (grated)
