Zesty Barbecue Cheeseburgers

Directions:

1. Combine Ground Beef, onion and 2 tablespoons barbecue sauce in medium bowl, mixing lightly but thoroughly.
2. Shape into four 1/2-inch thick patties.
3. Preheat grill to medium.
4. Place patties on cooking grid; grill, covered, 7 to 9 minutes until instant-read thermometer inserted horizontally into center registers 160°F, turning occasionally.
   Cook's Tip: Cooking times are for fresh or thoroughly thawed Ground Beef. Color is not a reliable indicator of Ground Beef doneness.
5. About 1 minute before burgers are done, brush with remaining 2 tablespoons barbecue sauce and top with cheese.
6. Line bottom half of each bun with lettuce leaves, red onion and tomato, as desired; top with burger. Close sandwiches.