Antonie van Leeuwenhoek: Antonie van Leeuwenhoek, Dutch microscopist who was the first to observe bacteria and protozoa. His researches on lower animals refuted the doctrine of spontaneous
1 Rub the dripping or butter over the joint. 2  Season generously with salt and pepper. 3  Roast the beef topside according to your desired temperature: 20 minutes per 500g, plus an additional 20 minutes for rare; 25 minutes per 500g, plus 25 minutes for medium; 30 minutes per 500g, plus 30 minutes for well done. Roast the beef topside according to your desired temperature: 20 minutes per 500g, plus an additional 20 minutes for rare; 25 minutes per 500g, plus 25 minutes for medium; 30 minutes per 500g, plus 30 minutes for well done.
For a two pound roast, roast uncovered in the oven for approximately 38 to 40 minutes or until the internal temperature reads 130Â° F. Let sit for 5 to 10 minutes. Final internal temperature will rise to 135Â° F which is medium rare. For a 4 lb. roast the total cooking time will be 40 to 50 minutes. * For the two pound roast total cooking time is 30 to 35 minutes. * The 10 ounce Chateaubriand will take approximately 14 to 16 minutes.