1. Begin by rubbing a sharp knife between the bones and the meat of the prime rib, cutting parallel to the bone, approximately 2/3 of the way. This will make it much easier for us to carve after cooking.
2. Truss the roast together, with at least one tie between each bone. Trussing will keep the bones attached to the rest of the joint, as well as help the prime rib to keep its shape during cooking.
3. Generously season all sides of the beef with the Grim Reaper rub.
4. Place the Prime rib on your smoker at about 225F-250F and smoke until you meet your desired internal temperature. Personally I like about 130F.
5. Remove beef from cooker and allow to rest for 20 minutes tented loosely in foil. As the meat is resting, heat up beef tallow in a cast iron pot or Dutch oven. Be mindful that the tallow will generally increase in size as it heats. Heat until tallow is between 300F-350F.
6. Using a long handled tool, entirely submerge the prime rib in the tallow for 1-2 minutes until a thick crust has formed on the exterior of the meat. Be mindful to avoid splatters of hot tallow on yourself and the burners.
7. Once crust is formed, remove from tallow and place on a butchers board for carving. Remove trussing and cut the the final 1/3 of meat between the joint and the bones to separate entirely.
8. Carve prime rib into 1/4-1/2 inch slices and serve. Prime rib is amazing with just about anything, but personally I think some great roasted potatoes, a leafy salad and homemade Yorkshire puddings are the ultimate accompaniment.