1 large red onion, thinly sliced (2 cups)
1/3 cup plus 2 tablespoons beer, divided
1 tablespoon packed light brown sugar
1 teaspoon Worcestershire sauce
1 1/2 pounds ground beef
6 slices Swiss cheese
6 hamburger rolls
Lettuce, tomato and condiments (optional
2. Mix remaining 1/3 cup beer and Worcestershire sauce in large bowl until well blended. Add ground beef; mix lightly. Shape into 6 patties.
3. Grill over medium heat 4 to 6 minutes per side or until burgers are cooked through . Add cheese slices to burgers 1 minute before cooking is completed. Toast rolls on the grill pan , open-side down, about 30 seconds or until golden. Serve burgers on toasted rolls with caramelized onions. Garnish with desired toppings and condiments.