ground beef, chuck
sweet onion (1/2-inch)
crusty rolls, split, toasted
Romaine lettuce, tomato slices
- Lightly shape ground beef into four 3/4-inch thick patties. Brush onion with oil. Place patties in center of grid over medium, ash-covered coals; arrange onion around patties. Grill, uncovered, 13 to 15 minutes to medium (160°F) doneness, until patties are not pink in center and juices show no pink color and onions are tender, turning occasionally. Season with salt and pepper after turning. About 1 minute before patties are done, top each with 2 cheese slices.
- Combine mayonnaise and mustard; spread on top halves of rolls. Serve burgers and onion in rolls with lettuce and tomato.