how long to cook beef for
Cook the beef for another 17 minutes per 450g (1lb). This will give you rare beef. For medium cooked beef add 15 minutes more, or for well done beef add 30 minutes more-the additional time is for the whole joint not per 450g / 1lb.You can tell if the joint is cooked to your liking by sticking a skewer into the middle of the joint.If the juices are clear it's well done.his will give you rare beef. For medium cooked beef add 15 minutes more, or for well done beef add 30 minutes more-the additional time is for the whole joint not per 450g / 1lb. You can tell if the joint is cooked to your liking by sticking a skewer into the middle of the joint.