Mix together rub ingredients. Rub on beef and let stand as it comes up to temperature from the refrigerator (20-30 minutes). Put on the grill over direct medium heat (note: basting is a bit dangerous in this condition as you're using oil. Moving the meat/turning off gas under meat is advisable.) Start blender with vinegar, and slowly add olive oil to make baste. Baste twice per side, turning the meat once. Will take ~30-35 minutes to reach internal temperature of 140F. Let stand ten minutes before slicing and serving.