Preheat the smoker to 190F
Remove excess fat from the shank, but not all of it. You want some left for making the meat juicy.
Season the meat on all sides with the barbecue rub.
Leave the meat to sit for at least ½ hour before cooking. However, the flavor increases if you put the spiced shank in the refrigerator overnight.
Place the shank in a disposable aluminum pan and put it into the smoker
When the meat reaches 165F, it will be a deep brown color with a nice bark
Pour the beef tallow over the shank at this point
Increase the smoker’s temperature to 275F
Smoke for another 5 hours.
The beef should feel like it’s falling apart and reads 208F internally.
Place the shank on a cutting board
Rest the meat for 45 minutes
Shred it for whatever you have planned.