Jul 14 2026
RestaurantsRistorante Del LagoThe Penrose Room French Onion Burger* Recipe

The Penrose Room French Onion Burger* Recipe

Time1h
Serves4

Bone Broth, Vidalia Onions, Muenster, Gruyère, Fresh Horseradish Aioli, Brioche Bun, Spiral Frites (Egg, Milk, Wheat)

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Ingredients

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Bone Broth

Onions

Cheese

Bun

Frites

Method

Bone Broth Preparation

  1. 1

    In a saucepan, heat the bone broth over medium heat until it is hot but not boiling. Keep it warm for assembling the burgers.

Onion Caramelization

  1. 2

    Caramelize the Onions

    Slice the Vidalia onions thinly. In a skillet, melt 2 tablespoons of butter over medium heat. Add the onions and cook slowly, stirring occasionally, until they are deep golden brown and caramelized, about 20-25 minutes. Set aside.

Burger Assembly

  1. 3

    Prepare the Burgers

    Shape ground beef into 4 patties, season with salt and pepper. Grill or pan-fry the patties over medium-high heat for about 4-5 minutes on each side or until they reach desired doneness.

  2. 4

    Add Cheese

    Place 1 slice of Muenster and 1 slice of Gruyère cheese on each patty during the last minute of cooking. Cover with a lid to help the cheese melt.

Aioli Preparation

  1. 5

    Make the Horseradish Aioli

    In a bowl, mix mayonnaise, fresh horseradish, and lemon juice until well combined. Adjust seasoning with salt to taste.

Frites Preparation

  1. 6

    Prepare the Spiral Frites

    Spiral cut the potatoes using a spiralizer. Rinse the spirals in cold water and pat dry. Heat the vegetable oil in a deep fryer or large pot to 350°F (175°C). Fry the potato spirals in batches until golden brown and crispy, about 3-4 minutes. Drain on paper towels and season with salt.

Final Assembly

  1. 7

    Assemble the Burger

    Spread the horseradish aioli on the bottom half of each brioche bun. Top with the grilled beef patty with melted cheese, a generous scoop of caramelized onions, and the top half of the bun.

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