Irresistible French Onion Soup Burgers  - dgratis.info

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 Gruyère or Swiss cheese
• 4 hamburger buns
• 1 clove garlic, minced (optional for garlic butter buns)
• Additional butter for buns