Description

The French Onion Croissant Burger is a decadent twist on a classic cheeseburger, featuring juicy beef patties seasoned with Worcestershire sauce, topped with sweet caramelized onions and melted Swiss cheese, all layered between buttery, flaky croissant buns. Enhanced by a creamy Dijon-mayo sauce and optional fresh thyme or arugula, this burger offers a rich and savory gourmet experience perfect for an indulgent home meal.

Ingredients

Scale

For the Burger Patties

1 lb ground beef (80/20)
1 teaspoon salt
1/2 teaspoon black pepper
1 tablespoon Worcestershire sauce

For the Caramelized Onions

2 tablespoons butter
2 large yellow onions, thinly sliced
1/2 teaspoon sugar

For the Sauce

2 tablespoons mayonnaise
1 tablespoon Dijon mustard
1 teaspoon lemon juice

For Assembly

4 croissant buns, halved
4 slices Swiss cheese
Optional: fresh thyme or arugula for garnish

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Instructions

Caramelize the Onions: In a skillet over medium heat, melt the butter. Add the thinly sliced onions and sugar, and cook slowly, stirring often, for 20 to 25 minutes until the onions are golden brown and caramelized.
Prepare the Burger Patties: While the onions cook, combine the ground beef with Worcestershire sauce, salt, and black pepper. Mix gently and shape into 4 equal-sized patties.
Cook the Patties: Heat a skillet or grill over medium-high heat. Cook the patties for 3 to 4 minutes per side until they reach your desired doneness. In the final minute of cooking, place a slice of Swiss cheese on each patty and allow it to melt.
Make the Dijon Sauce: In a small bowl, whisk together mayonnaise, Dijon mustard, and lemon juice until smooth and combined.
Toast and Assemble: Lightly toast the croissant buns. Spread the Dijon sauce on the bottom halves, then layer with a cheesy burger patty, followed by a generous portion of caramelized onions. Garnish with fresh thyme or arugula if desired, then top with the croissant bun lids.
Serve Warm: Serve the sandwiches immediately while warm, accompanied by your favorite sides such as fries, salad, or pickles.

Notes

Croissant buns can be purchased at bakeries or made by slicing large bakery croissants horizontally.
For deeper flavor, add a splash of beef broth or red wine to the onions as they caramelize.
This burger pairs wonderfully with crispy fries, a fresh side salad, or pickles for added tang.