Start your smoker and get the temperature stable at 225ºF.
Coat your pork shoulder all over with the yellow mustard and season with the Not Just Pork Rub.
Place the shoulder directly on the grill and smoke low and slow until the shoulder reaches an internal temperature of 195ºF.
Remove the pork from the grill and wrap it completely in aluminum foil. Place it in a cooler, cover the cooler, and let it rest for 1 to 2 hours.
Remove the pork from the cooler and remove the shoulder bone. Pull the pork apart using your fingers. Serve alone or in your favorite pulled-pork dish.