In a large skillet, heat butter and olive oil over medium heat. Add the onions and cook, stirring occasionally, until they begin to soften.
Sprinkle the onions with sugar and continue to cook, stirring occasionally, until they are caramelized, about 20-25 minutes. Add the Worcestershire sauce and cook for an additional 2 minutes. Season with salt and pepper to taste. Remove from heat and set aside.
Preheat a grill or grill pan to medium-high heat. Season the ground beef with salt and pepper and form into 4 patties.
Grill the patties for about 4-5 minutes per side, or until they reach your desired level of doneness. During the last minute of cooking, place a slice of Swiss cheese on each patty to melt.
Toast the burger buns on the grill for about 1 minute.
Assemble the burgers by placing a patty on the bottom half of each bun, topping with caramelized onions, and finishing with the top half of the bun. Garnish with fresh thyme if desired.
French Onion Soup Burgers are considered gourmet due to their upscale twist on a classic dish. They typically feature caramelized onions, beef patties seasoned with herbs and spices reminiscent of French onion soup, and often include melted Gruyère or Swiss cheese on top.
How do I caramelize onions for French Onion Soup Burgers?
To caramelize onions, thinly slice them and cook them slowly over medium-low heat in butter or olive oil until they turn golden brown and sweet. This process can take about 20-30 minutes, stirring occasionally to prevent burning.
Can I use any type of cheese for French Onion Soup Burgers?
While Gruyère or Swiss cheese is traditional for French Onion Soup Burgers, you can use other cheeses like provolone, mozzarella, or even sharp cheddar depending on your preference for flavor and melting properties.
What kind of bun works best for French Onion Soup Burgers?
A crusty yet soft bun like a brioche bun or a hearty French bread roll works well for French Onion Soup Burgers. These buns can hold up to the juicy burger patty and caramelized onions without becoming soggy.
Can I prepare French Onion Soup Burgers ahead of time?
You can prepare components like caramelized onions and burger patties ahead of time. Assemble the burgers just before serving to ensure they are hot and fresh. Optionally, you can toast the buns and melt the cheese under a broiler or on the grill just before serving for extra flavor.
