Home-Style Ribs

4 to 5 pounds boneless pork spareribs, cut into pieces
1 medium onion, thinly sliced
1 cup ketchup
1/2 to 1 cup water
1/4 cup packed brown sugar
1/4 cup cider vinegar
2 tablespoons Worcestershire sauce
2 teaspoons ground mustard
1-1/2 teaspoons salt
1 teaspoon paprika

Place half of the ribs in a 5-qt. slow cooker; top with half of the onion. Repeat layers. Combine the remaining ingredients; pour over all. Cover and cook on low for 8-9 hours or until ribs are tender. Makes 6-8 servings.