Beef and mutton, 15 minutes for every pound and 15 minutes over.
Pork, lamb and veal, require 20 minutes to the pound and 20 minutes over.
Dr. Kitchiner says โA noble sirloin of about 15 pounds will require to be before the fire for about 3ยฝ or 4 hours. The fire must be well built, sound, and even.โ
A thin piece will require a small brisk glowing fire.
The smaller the joint to be roasted the higher the temperature to which its surface should be exposed.