Smoke them at 275°F until they hit an internal temperature of about 170°F.
Once they reach 170°F, braise the shanks in beef cons in a tin until they hit between 200°F to 205°F.
Once cooked, let the beef shanks rest before shredding.
Shred the beef from the shank, removing any silver skin and sinew, combining it with the rendered fat and juices.