Ingredients:
- 1 lb ground beef
- 2 large onions, thinly sliced
- 2 tablespoons butter
- 1 teaspoon sugar
- 1/2 cup beef broth
- 2 tablespoons Worcestershire sauce
- 1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried thyme)
Salt and pepper to taste - 4 slices of Gruyère or Swiss cheese
- 4 hamburger buns
- 1 clove garlic, minced (optional for garlic butter buns)
Additional butter for buns
Directions:
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1. Caramelize Onions:
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Melt butter in skillet over med-low.
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Thinly slice onions with mandoline. Cook with sugar 20-25 mins until golden.
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Deglaze with broth and Worcestershire; stir in thyme.
2. Form & Cook Burgers:
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Mix ground beef with salt, pepper, 1 tbsp Worcestershire. Press into patties.
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Sear in skillet 4-5 mins/side (135°F for medium).
3. Toast Buns:
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Mix garlic + 2 tbsp butter. Brush on brioche buns; toast until golden.
4. Assemble & Broil:
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- Place patties on baking tray. Top with onions + Gruyère.
- Broil 2 mins until cheese bubbles.
- Sprinkle thyme; sandwich in buns.
