1: Remove membrane with a butter knife.
2: Lightly coat ribs in mustard as a binder.
3: Apply rib rub heavily and let sit on each side for 20 minutes.
4: Bake uncovered at 275°F for 3.5 hours.
5: Coat with BBQ sauce and return to the oven for an additional 10 minutes.
6: Slice and serve.
