Always preheat the oven so that it
is hot and at the correct
temperature before the meat goes
in. For beef on the bone: for rare,
cook for 10-12 minutes per pound
(450g) plus 12 minutes; for medium,
cook for 12-15 minutes per pound
(450g) plus 12 minutes; for
well-done, cook for 18-20 minutes
per pound (450g) plus 18 minutes.