These are no ordinary burgers. Combine brown sugar, beer, mustard and vinegar to prepare a barbecue sauce to add extra flavor to Ground Beef burgers.
To prepare barbecue sauce, combine brown sugar, mustard, beer and vinegar in small saucepan; bring to a boil. Reduce heat and simmer 15 to 17 minutes until thickened and reduced in to 1/2 cup, stirring occasionally.
Lightly shape Ground Beef into four 1/2-inch thick patties. Place patties on grid over medium, ash-covered coals. Grill, covered, 8 to 10 minutes (over medium heat on preheated gas grill, covered, 7 to 9 minutes) until instant-read thermometer inserted horizontally into center registers 160°F, turning occasionally. About 2 minutes before burgers are done, place bun, cut sides down, on grid. Grill until lightly toasted.
Spoon 1 tablespoon sauce on bottom of each bun; top with burger. Evenly spoon remaining sauce on burger. Evenly top burgers with cabbage. Close sandwiches.
Test Kitchen Tips Keeping the lid closed lets the grill cook like an oven, with the heat reflecting off interior surfaces and cooking the food from all sides.