This is a 13lb prime rib that I cooked for 14 people. I started by putting a thick layer of a beef stock, butter, rosemary, and garlic rub on it. I cooked it at 450 degrees for 30 minutes, covered it with tin foil and then cooked it at 250 degrees for 5 hours (the internal temperature was 157 degrees). My family likes theirs a little more well done so the rarest piece of meat was only medium. The rub put a nice crust on the meat and provided a lot of flavor.
I served it with baked potatoes with butter and sour cream, green salad, cherry jello salad, rolls, vegetables and au jus sauce. I couldn't get any more pictures because I was cutting and serving the meat.