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4 Place the roast fat side up and rib bones down in a roasting pan. Insert a meat thermometer into the thickest part of the roast, making sure that the thermometer isn't touching a bone. 5 After browning the roast at a 500Â°F temperature in the oven for 15 minutes, reduce the oven temperature to 325Â°F.To figure out the total cooking time, allow about 13-15 minutes per pound for rare and 15-17 minutes per pound for medium rare.oast in oven until thermometer registers 115Â°-120Â°F for rare or 125Â°-130Â°F for medium. (The internal temperature of the roast will continue to rise after you take the roast out of the oven.). Check the temperature of the roast using a meat thermometer 30 to 45 minutes before you expect the roast to be done.
1 Roast beef for 5 minutes per pound. 2  Then turn off oven. 3  DO NOT OPEN OVEN FOR 2 HOURS! (For example, a 4-lb. roast would take 20 minutes to cook and then sit in the turned-off oven for 2 hours.). Preheat oven to 500 degrees. 2  If desired, trim off excess fat from roast beef. 3  Season with salt and pepper (and paprika, if desired). 4  Rub meat with vegetable oil. 5  Place meat in roasting pan in preheated oven. 6  Roast beef for 5 minutes per pound.