This recipe uses slices of Gruyére cheese for visual effect. To create the stringy, chewy goodness found in classic restaurant-style French Onion Soup, use equal amounts (3 oz. each) of coarsely grated Gruyére cheese and Mozzarella instead of the Gruyére and Parmesan used below.
Tip: To prevent cracking, don’t place ramekins or bowls too close to the broiler if you don’t know their temperature rating. Keep a close watch while broiling to prevent over-browning.
This rich and delicious recipe takes some time to come together. However, the results are well worth it. The richly caramelized onions and slowly simmered broth are incredible.