Onion Soup Gratinée Recipe

Soup Preparation

1. 1

   Caramelize the Onions

   In a large pot, melt the butter over medium heat. Add the sliced onions and cook, stirring occasionally, until they are caramelized and golden brown, about 30-40 minutes.

2. 2

   Add Garlic and Broths

   Once the onions are caramelized, add the minced garlic and cook for an additional minute. Pour in the beef and duck broth, and add thyme, bay leaf, salt, and black pepper.

3. 3

   Simmer the Soup

   Bring the mixture to a gentle boil, then reduce the heat to low and let it simmer for 20 minutes. Remove bay leaf before serving.

4. 4

   Prepare the Cheese Topping

   In a bowl, mix together a blend of cheeses such as Gruyère, Emmental, and Parmesan (about 2 cups total).

5. 5

   Assemble and Broil

   Ladle the soup into oven-safe bowls, top each with a generous amount of the cheese blend, and place under the broiler until the cheese is bubbly and golden, about 3-5 minutes.