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To appreciate the French onion burger fully, it helps to delve into the history of its foundational element—French onion soup. Originating in the 18th century, this classic French dish was initially a humble meal enjoyed by the working class. Made with just a few basic ingredients—onions, beef broth, and bread—it quickly gained popularity due to its rich flavor and heartiness. Over time, French onion soup evolved into a culinary icon, celebrated for its comforting qualities and elegant presentation, often topped with melted cheese and toasted bread.

French Onion Burgers

Savor the taste of a French onion burger, a delicious twist on a classic favorite that brings the comfort of French onion soup straight to your plate. This gourmet burger is loaded with caramelized onions, melted cheese, and a hint of beef broth, all nestled in buttery brioche buns. Perfect for any meal, this recipe is simple to make and will have everyone asking for seconds.
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Ingredients
  

1 lb ground beef (80% lean)

1 large onion, thinly sliced

2 tablespoons unsalted butter

1 tablespoon olive oil

1 teaspoon sugar

1 teaspoon beef broth base (or bouillon powder)

4 slices Swiss cheese (or Gruyère)

4 burger buns (preferably brioche)

Salt and pepper to taste

Fresh thyme leaves for garnish (optional)

Instructions
 

Caramelize the Onions: In a large skillet, heat the butter and olive oil over medium heat. Add the sliced onion and sprinkle with sugar. Cook for 15-20 minutes, stirring occasionally until the onions are soft and caramelized, and turn a golden brown. Add the beef broth base for extra flavor and mix well. Remove from heat and set aside.

    Prepare the Burgers: While the onions are cooking, form the ground beef into four equal patties. Season each side with salt and pepper.

      Cook the Burgers: In the same skillet (wipe it down if necessary), increase the heat to medium-high. Cook the burger patties for about 4-5 minutes on each side for medium doneness, or until your desired doneness is reached.

        Melt the Cheese: During the last minute of cooking, place a slice of Swiss cheese on each patty and cover the skillet with a lid to help the cheese melt nicely.

          Toast the Buns: If desired, you can toast the burger buns in a toaster or on a separate skillet until golden brown.

            Assemble: On the bottom half of each toasted bun, place a cheeseburger patty, topped with a generous helping of caramelized onions. Add the top bun to complete the burger.

              Garnish and Serve: Optionally sprinkle fresh thyme leaves on top for an aromatic touch. Serve hot with your choice of side (fries, chips, or a salad).

                Prep Time: 15 minutes | Total Time: 45 minutes | Servings: 4 burgers