French Onion Burger

Start the onions by melting 3 tablespoons of butter in a large, heavy‑bottomed skillet. Add the onion rings and cook over medium heat for 20–30 minutes, stirring occasionally, until they’re soft, golden, and deeply caramelized.

Once the onions reach a deep golden brown, pour in the 1/2 cup of beef broth. Continue cooking until the liquid has fully evaporated and the onions have reduced to a jam‑like consistency. Remove the onions from the heat and set them aside. There’s no need to wipe out the skillet — all that caramelized onion flavor will season the burgers beautifully.

Meanwhile, mix the ground beef with 1 egg, salt, pepper, and 1 tablespoon Worcestershire sauce. Form the mixture into four 6‑ounce patties. Add 2 tablespoons of butter to the same skillet you used for the onions and melt it over medium heat. Place the patties into the buttery pan.

Cook the patties for 6–8 minutes per side, undisturbed, to allow a flavorful crust to form.

To make the aioli, mix 1/2 cup mayonnaise, 2 teaspoons Dijon mustard, 2 teaspoons lemon juice, a pinch of salt and pepper, and 1 minced garlic clove in a small bowl. Stir until it’s smooth and creamy.

Butter the hamburger buns and toast them in a toaster oven or under the broiler until golden.

Add two slices of Swiss cheese to each burger just before they finish cooking and let the cheese melt over the patties. Once melted, transfer the burgers to a plate and set aside. Place each patty on a toasted bun, top with a generous spoonful of the caramelized onions, sprinkle with freshly chopped parsley, and finish with the top bun spread with the aioli.

Enjoy!

Check out our other burger recipes here: Burgers