Heat closed medium-size contact grill for 5 minutes. Position drip tray to catch drippings. Place pork on grill. Close grill; cook 5 to 6 minutes or until no longer pink in center. Meanwhile, place cheese on cut sides of roll bottoms; top with ham, pleating to fit. Spread mustard and pickle relish on cut sides of bun tops. Place grilled pork on ham; place roll tops, relish sides down, on pork. Press down firmly on tops of sandwiches (sandwiches are thick).