Took olive oil and rubed prime all over, then take above rub and rub the prime, let sit over night in frige. Get yourself a piece of door screen and lay on table.Get a box of kosher salt and add about 1 cup of water to it and make a paste. Layer the screen with about 1/2" paste and set your prime on it. Take the rest of your paste and cover the rest of the prime with at least a 1/4". Put on your grill with indirect heat at about 220 degrees for 4 hours or to your liking.
The salt makes like a shell and will pop right off. Kinda fun and people will think your half nuts till they eat this juicey piece of prime. From a old Marine groundpounder take care over there.