Easiest?
Marinade over night in Paul Newman's (or any other Italian dressing) Brill your grill temp as high as you can get it, I wait until over 550 degrees.
Seer each side for just a couple minutes at most and remove.
Reduce grill temp to 350 deg.
Using a thermometer, cook until desired internal temp (I remove at 185 deg, wrap tightly in foil, and let sit for 10 minutes.
Favorite way, use same marinade, then add rub of your choice place in smoker until internal temp hits 185. Remove from smoker
Wrap in foil for 10 minutes.