Take ribs out of package and pat dry with paper towel.
Remove sternum, flap (skirt) meat, and score membrane.
Combine rub ingredients in specified quantities. Apply a light layer to the bone side and a heavier layer to the meat side. The dry rub listed is enough for 2 racks of spare ribs. 1/4 cup 16 Mesh Black Pepper, 2 tbsp Diamond Crystal Kosher Salt, 1/2 tbsp Celery Salt, 1/2 tbsp Achiote Powder OR Paprika