Plan ahead and dry-brine the steak overnight or even up to two hours in advance. Sprinkle liberally with kosher salt and leave uncovered in the fridge.
Remove steak from the fridge and dry with a paper towel to remove any water. You can season with pepper or steak seasoning, but avoid adding more salt if you followed the first step.
Heat your grill up to about 200 – 250°F. On a charcoal grill, use 2/3 of a chimney of charcoal with the vents fully open until the grill hits 180°F and then close the bottom vent about 3/4. On a gas grill, turn one or two burners onto medium/low and leave one burner off to create an indirect heat zone.
Place steak on the cool side of the grill with the fattier or bone side pointed towards the hot part of the grill.
For medium rare, remove steak when it hits an internal temperature of 110 – 115°F. This can take 30-45 minutes. Place a pat of butter on the steak and wrap loosely in foil.
While your steak is resting, add more charcoal on top of the lit pieces or turn your burners up to high. Allow 10 minutes for the grill to get hot enough to sear and finish the steak.
Finish the steak with a quick sear, flipping every 45 seconds. Remove steak from the grill when it hits 127-130°F for medium rare.
Slice steak and serve.