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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
