In a large resealable bag, combine the first eight ingredients; add pork. Seal bag and turn to coat; refrigerate overnight.
Drain and discard marinade. Thread the pork onto metal or soaked wooden skewers. Grill, covered, over indirect medium heat for 5-6 minutes on each side or until meat is no longer pink.
In a saucepan, combine the cornstarch, garlic salt and pepper. stir in broth until smooth. Add milk, peanut butter and onion; stir until blended. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with the kabobs. Yield: 4 servings.