Jul 14 2026
RestaurantsFish Bones GrillFrench Onion Soup Au Gratin Recipe

French Onion Soup Au Gratin Recipe

Inspired by Fish Bones Grill
Time1h 30m
Serves4

House croutons & Swiss gruyere

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Ingredients

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Ingredients

Method

Directions

  1. 1

    Prepare the Onions

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

  2. 2

    Add Flavor

    Stir in the minced garlic and cook for another minute until fragrant. Add the dry white wine to deglaze the pot, scraping up any browned bits from the bottom.

  3. 3

    Simmer the Broth

    Pour in the beef broth, then add thyme, bay leaves, salt, and pepper. Bring the mixture to a boil, then reduce heat and let it simmer for 20 minutes.

  4. 4

    Toast the Bread

    While the soup simmers, preheat your oven to 400°F (200°C). Place the sliced baguette on a baking sheet and toast it in the oven until golden and crispy, about 10 minutes.

  5. 5

    Assemble the Soup

    Remove the bay leaves from the soup. Ladle the soup into oven-safe bowls. Place a toasted slice of bread on top of each bowl and sprinkle generously with Swiss and Gruyère cheese.

  6. 6

    Broil

    Place the bowls under the broiler for 2-5 minutes, until the cheese is melted and bubbly. Keep a close eye to avoid burning.

  7. 7

    Serve

    Carefully remove the bowls from the oven and let them cool slightly before serving. Enjoy your French Onion Soup au Gratin!

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