Preheat a smoker according to the manufacturer's instructions.
Season brisket with salt and pepper on both sides. Place brisket, fat side up, in the smoker, with the largest end towards the fire box. Do not place meat any closer than 3 feet from the fire. Smoke for 8 hours. Remove brisket to a platter and brush with BBQ sauce. Carve or pull meat as desired.
Combine all ingredients in a medium saucepan. Stir to combine and then simmer for 30 minutes over low heat.