For the filling, in a small bowl combine crabmeat,artichoke hearts,cheese, and green onion.
Trim fat from beef.Butterfly the meat by making a lenghtwise cut down the center of meat,cutting to within 1/2 inch of the other side.Spread open. Place knife in the "v" of the first cut. Cut away from the first cut and parallel to the cut surface to within 1/2 inch of the other side of the meat. Repeat on opposite side of "v." Spread pepper evenly over meat; rub in with your fingers.
For grilling, Preheat grill,reduce to medium.Place meat on grill for 8-10 minutes or until browned,turning frequently.Place meat over a drip pan. Adjust for indirect cooking. Cook 35-40 minutes for medium rare.