Cut pork into 24 (6 x 1/2-inch) strips; place in a large bowl.
Combine peanut butter and next 6 ingredients (peanut butter through garlic) in a small bowl; stir well with a whisk. Add 1/4 cup peanut butter mixture to pork; toss well. Cover and marinate in refrigerator 30 minutes. Reserve remaining peanut butter mixture.
Thread pork onto 24 (6-inch) skewers.
Preheat grill or broiler.
Place skewers on grill rack or broiler pan coated with cooking spray; grill or broil 3 minutes on each side or until done. Sprinkle with pepper. Serve with reserved peanut butter mixture.