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 15
Remove pork from grill; let stand 5 minutes.
Cut pork diagonally across the grain into thin slices.
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.
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.