1. Preheat grill to high heat.
2. Combine first 8 ingredients in a bowl, stirring well with a whisk. Reserve 1/4 cup ketchup mixture; set aside. Add pork to remaining ketchup mixture; turn to coat pork. Place pork on a grill rack coated with cooking spray; cover and grill 5 minutes. Turn pork over; grill 6 minutes or until a thermometer inserted in thickest portion registers 150°. Remove pork from grill; let stand 5 minutes. Cut pork diagonally across the grain into thin slices.
3. Arrange buns, cut sides down, in a single layer on grill rack coated with cooking spray; grill 2 minutes or until golden brown and toasted.
4. While pork grills, combine cabbage and remaining ingredients in a medium bowl; toss. Let stand 10 minutes; drain. Place one bottom bun half on each of 4 plates; divide sliced pork evenly among buns. Top each serving with 1 tablespoon reserved sauce and about 1/2 cup slaw. Place top halves of buns on sandwiches.