Place pork on hottest side of grill; sear 1 to 2 minutes on each side, being careful not to burn pork. Move pork to cooler side of grill; cook 10 to 20 minutes, turning several times and basting both sides generously with soy sauce mixture, until pork is firm to the touch, juices run clear and center is just pink when cut with knife. (The timing will depend on the heat of the grill and the thickness of the chops. Covering the grill will speed the cooking time.) Discard any remaining basting sauce.