Ingredients
Method
Directions
- Heat the butter and olive oil in a skillet over medium-low heat.
- Add the onions and cook, stirring occasionally, for 25 to 30 minutes until caramelized.
- Stir in the beef broth and Worcestershire sauce.
- Simmer for 3 to 4 minutes until slightly reduced and spoonable. Set aside.
- Preheat a grill or skillet/griddle over medium-high heat.
- Season the burger patties lightly with salt and black pepper.
- Cook the patties until browned and cooked to your preferred doneness, turning once or as needed. Cook time may vary depending on patty thickness, cooking method, and whether cooking from frozen.
- During the last 1 to 2 minutes of cooking, top each patty with a slice of Gruyère cheese.
- Avoid pressing down on the patties while they cook, as this can squeeze out flavorful juices.
- Lightly toast the French rolls until warm and lightly crisp. Toasting helps the rolls hold up better and adds texture.
- Let the patties rest for 3 to 5 minutes.
- Assemble the burgers with the patty on the bottom roll, then top with the onion reduction. Add the top roll and serve right away.
