Continue cooking until the color is a deep red or mahogany color and the meat has just begun to pull back from the bones. Add two pats of butter, half of the brown sugar, some additional rub, and a few sprays of the apple juice to the center of the foil. Place the ribs, meat side down, onto the foil and repeat this process for the backside of the ribs. Wrap tightly and return to the smoker until tender and when an instant read thermometer hits 205.