French Onion Soup

Name: French Onion Soup
Prep time: 15 min
Cook time: 1 h 6 min
Total time: 1 h 21 min
Cuisine: European, Mediterranean, French
Ingredients: 3 tablespoons butter; 3 onions, thinly sliced; 2 tablespoons water; 2.5 tablespoons all-purpose flour; 6.3333334922791 cups chicken stock; 0.33333334326744 cup white wine; 1 tablespoon white wine; 0.5 teaspoon salt; 0.25 teaspoon ground black pepper; 6 (1/2 inch) slices French baguette; 0.5 cup shredded Gruyère cheese