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2 large yellow onions, thinly sliced
2 tablespoons butter
1 tablespoon olive oil
1 teaspoon sugar
1/2 teaspoon salt
1 pound ground beef
1/2 teaspoon garlic powder
1/2 teaspoon onion powder
1/4 teaspoon black pepper
4 slices of Gruyere cheese
4 hamburger buns
1/4 cup beef broth
1 teaspoon Worcestershire sauce
Fresh thyme sprigs (optional)
Directions
1. In a large skillet, heat the butter and olive oil over medium heat. Add the sliced onions, and cook until they start to soften, about 5 minutes.
2. Sprinkle the sugar and salt over the onions, and continue to cook, stirring occasionally, until the onions are caramelized and golden brown, about 20-25 minutes.
3. Stir in the beef broth and Worcestershire sauce, allowing the mixture to simmer until the liquid has mostly evaporated. Remove from heat and set the onions aside.
4. In a bowl, combine the ground beef, garlic powder, onion powder, and black pepper. Mix until well combined and form into 4 patties.
5. Preheat a grill or skillet to medium-high heat. Cook the patties for about 4-5 minutes on each side, or until they reach your desired level of doneness.
6. During the last minute of cooking, place a slice of Gruyere cheese on each patty, allowing it to melt.
7. Toast the hamburger buns on the grill or in a skillet until they are golden brown.
8. To assemble the burgers, place the patties on the bottom half of each bun. Top with a generous portion of the caramelized onions. Add a sprig of fresh thyme, if using, for an added touch of flavor.
9. Cover with the top half of the buns and serve warm.
Variations & Tips
For a twist, you could substitute Swiss cheese for the Gruyere or use a combination of both. If you're looking for a bit more depth, try mixing in a teaspoon of balsamic vinegar with the caramelized onions. For a lighter version, use ground turkey or chicken instead of beef. If you fancy a bit of heat, add a pinch of red pepper flakes to the onions while they caramelize.
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