Cajun-Style Barbecued Ribs

3 pounds pork spareribs or back ribs1 cup hickory smoke-flavored barbecue sauce1/2 teaspoon hot pepper sauce1/2 teaspoon ground red pepper1/2 teaspoon onion powder1/2 teaspoon garlic powder1/2 teaspoon celery seed1/2 teaspoon dried thyme leaves, crushedParboil ribs for 45 minutes.Combine remaining ingredients in saucepan; mix well. Bring to boil; reduce heat. Simmer 10 minutes, stirring occasionally.For outdoor cookingPlace ribs, bone side down, on greased grill over low coals (coals will be ash gray). Grill, uncovered, 30 minutes, turning after 15 minutes.Brush with barbecue sauce mixture and continue grilling 20 minutes, turning and brushing with barbecue sauce mixture after 10 minutes.Makes 6 servings.