Place all ingredients in small mixing bowl and stir well until incorporated.
Start by trimming any excess fat from the ribs. Blot with a paper towel and sprinkle homemade bbq rub all over both sides of ribs. Add mustard and rub into the baby back ribs. Marinate for 24 hours, if time is on your side. If you don’t have time to marinate, the ribs can be cooked immediately.
Remove the ribs from the smoker and increase the temperature to 250 degrees. Slather honey and sprinkle sugar all over the ribs. Lay the ribs meat side down on heavy-duty aluminum foil. Pour grape juice all over the ribs. Wrap up and seal.
Return to smoker and cook for two hours longer and then test for tenderness.
Preheat oven to 350 degrees.
Place ribs on two sheets of heavy-duty aluminum foil. Sprinkle both sides with bbq rub. Spread mustard all over ribs. Wrap tightly and cook for 1 hour.
Remove from oven and open the foil. Sprinkle sugar and honey all over the ribs. Pour grape juice on ribs.
Return to oven and cook for 1 hour longer. After cooking for 2 hours total, remove from oven. Slather 2 cups of BBQ sauce all over the ribs. Return to oven with foil open and continue to cook at 425 degrees for 30 minutes.