Jul 09 2026
Restaurants›Fresko›French Onion Burger* Recipe

French Onion Burger* Recipe

Inspired by Fresko
Time1h
Serves2

8oz. 100% American Wagyu, caramelized onions, swiss cheese, horseradish aioli, potato bun

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Ingredients

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Burger Patty

Caramelized Onions

Horseradish Aioli

Assembly

Method

Burger Patty

  1. 1

    Prepare the Wagyu Patty

    Shape the 8 oz. of Wagyu beef into two equal patties, about 3/4 inch thick. Season both sides with salt and pepper.

  2. 2

    Cook the Patty

    Heat a skillet or grill over medium-high heat. Cook the patties for 4-5 minutes on each side for medium-rare, or longer according to your desired doneness.

Caramelized Onions

  1. 3

    Slice the Onions

    Peel and slice the yellow onions into thin strips.

  2. 4

    Cook the Onions

    In a large skillet, heat the butter and olive oil over medium heat. Add the sliced onions and sprinkle with salt. Cook for 20-25 minutes, stirring occasionally, until the onions are deep golden brown and caramelized.

Horseradish Aioli

  1. 5

    Mix the Aioli

    In a bowl, combine the mayonnaise, prepared horseradish, lemon juice, garlic powder, and salt. Stir until well mixed. Adjust seasoning to taste.

Assembly

  1. 6

    Assemble the Burger

    Toast the potato buns lightly. On the bottom half of each bun, spread a generous amount of horseradish aioli. Place the cooked Wagyu patty on top, followed by the caramelized onions and a slice of Swiss cheese. Top with the other half of the bun.

  2. 7

    Serve

    Serve the burger immediately, with extra horseradish aioli on the side if desired.

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