Backyard Barbecue Burger

Makes 6 servings

1-1/2	pounds ground beef
1/3	cup barbecue sauce, divided
1	to 2 tomatoes, cut into slices
1	onion, cut into thick slices
1	to 2 tablespoons olive oil
6	kaiser rolls, split
6	leaves green or red leaf lettuce

Prepare grill for direct grilling. Combine ground beef and 2 tablespoons barbecue sauce in large bowl. Shape into six 1-inch-thick patties.
Place patties on grid over medium heat. Grill, covered, 8 to 10 minutes (or, uncovered, 13 to 15 minutes) for medium doneness or until 160°F in centers of patties, turning and brushing often with remaining barbecue sauce.
Meanwhile, brush tomato and onion slices* with oil. Place on grid. Grill tomato slices 2 to 3 minutes and onion slices about 10 minutes.
Just before serving, place rolls, cut side down, on grid; grill until lightly toasted. Serve patties on rolls with tomatoes, onions and lettuce.