Combine the ingredients for barbecue sauce in a small saucepan and bring to a boil. Reduce the heat and simmer 15 to 17 minutes until thickened and reduced to 1/2 cup, stirring occasionally.
Form four 1/2-inch thick Ground eef patties. Over medium, ash-coated coals, grill the patties for 8 to 10 minutes (7 to 9 minutes over medium heat on a preheated gas grill), turning occasionally, or until an instant-read thermometer inserted horizontally into the center registers 160 degrees F. Grill the buns, cut side down for about 1 minute. Lightly brush the top of each bun with some of the barbecue sauce. Serve the burgers on the buns with additional barbecue sauce and coleslaw, if desired. Enjoy!
Serve with 1 tablespoon sauce on the bottom of each bun, followed by the burger. Top each burger equally with cabbage leaves. Evenly cover the burgers with shredded cabbage. Close sandwiches by folding them in half and pressing firmly together.