Place roast in a shallow baking pan bone down, melt butter in small saucepan and add garlic and salt and pepper. Mix well, brush over roast, and let stand at room temperature for 2 hours.
Preheat oven to 450°F. Use a probe meat thermometer*, placed into the center of the roast but not touching bone. Roast for 10 minutes in uncovered pan, then reduce heat to 350°F and continue for 1 hour and 20 minutes for rare. Baste with pan drippings from time to time. Thermometer should read 120° - 125° for rare, 130° - 135° for medium rare. Do not cook beyond 140°, medium. Let the roast stand for 15 minutes, with the probe in the meat, before slicing. Slice either between the bones or cut off all the bones at once and the slice the meat into serving pieces.
Roast 15 minutes more if you want a medium roast, another 15 minutes for well done.
Remove from oven when done, and allow the meat to rest for a few minutes before carving. Transfer to a warmed serving platter.
• A digital probe meat thermometer – the probe remains in the meat while in the oven and the control sits outside on the stove or counter. See link below