Barbecued Spare Ribs

4 pounds pork spareribs cut in serving-size pieces
Salt and pepper
1 medium onion
1 bottle (16 ounce) barbecue sauce, or use 2 cups of homemade barbecue sauce

Sprinkle ribs with salt and pepper; place on broiler rack. B roil ribs for 20- 25 minutes. Place ribs in slow cooker along with sliced onion and barbecue sauce. Cover and cook on LOW for 6 to 8 hours