Preheat oven to 250 degrees. Mix together the brown sugar and all of the dry remaining spices. Place ribs on a rimmed baking sheet and rub with the spice mix. Bake, meaty side up, covered with foil, for 3.5 hours. Mix together the apple cider, apple butter and pure maple syrup. Pour over the ribs and turn to coat. Bake for 30 more minutes. Finish on the grill and brush with BBQ sauce/Apple Butter mixture, turning and brushing until glazed, about 15 minutes. Let them rest for 10 minutes and then serve.