Rub each side of spareribs with salt & pepper. Cut ribs into serving portions. Place ribs in broiler pan and broil 15 min. or until browned. Drain. Put sliced onion in crock pot. Place rib sections on top of onions. Pour barbeque sauce on top.
Cover and cok on LOW 8 to 10 hrs. or on HIGH 4 to 5 hrs.