Spicing up store-bought barbecue sauce with a touch of cayenne and a splash of vinegar is an easy trick that makes a big difference. Here, pork burgers get a triple hit of flavor: The sauce gets mixed into the meat, slathered onto the cooked burgers for the last minute of grilling, and brushed on the bun. A cabbage slaw with a creamy dressing tops them off with just the right crunch.
Stir together barbecue sauce, cayenne, 1/4 teaspoon salt, and remaining tablespoon vinegar until combined well.
04Mix together pork, 1/2 teaspoon salt, 1/4 teaspoon pepper, and 2 tablespoons barbecue sauce mixture until combined (do not overmix), then form into 4 (3/4-inch-thick) burgers (4 inches in diameter).
05Oil grill rack, then grill patties, covered only if using a gas grill, turning over occasionally, until just cooked through, about 6 minutes total. Brush top of each patty with 1 tablespoon barbecue sauce mixture, then turn over and grill 30 seconds. Brush top of each patty with 1 tablespoon barbecue sauce, then turn over and grill 30 seconds more.
06Brush cut sides of rolls with remaining 1/4 cup barbecue sauce, then sandwich patties and coleslaw between rolls.