For the ribs: 1  3 tablespoons kosher salt. 2  2 tablespoons chili powder. 3  2 tablespoons packed dark brown sugar.  2 tablespoons 1  paprika. 1 tablespoon garlic powder.  2 teaspoons ground 1  mustard. 1 teaspoon freshly ground black pepper.  2 full racks baby back pork ribs (about 5 to 6 pounds)