Backyard barbecue spareribs

4 pounds pork spareribs
1 cup catsup
salt and pepper, to taste
1/4 cup Worcestershire sauce
1 1/2 cups cherry cola soft drink
1/4 cup vinegar
2 teaspoons paprika
2 teaspoons chili powder
1 medium onion, finely chopped

Cut ribs into serving-size pieces and place on grill over grey-white coals. Slowly cook 1 to 1 1/4 hours, turning often. Combine remaining ingredients in a saucepan and simmer 10-15 minutes. Brush ribs generously with sauce and continue to cook, about 30 minutes, basting and turning often.