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.
How long and at what temperature should I cook a beef roast in the oven? Roasting is a great cooking method for a large, tender cut of beef  such as a rib or sirloin roast.Sirloin-tip, rump, rolled-rump, eye-of-round or top-round roasts will also benefit from this cooking method if they are graded prime or choice. boneless top round, by contrast, will take 28-30 minutes for rare, 30-33 for medium rare, 34-38 for medium, and 40-45 for well done. If you roast at 325Â°F (160Â°C), subtract 2 minutes or so per pound. If the roast is refrigerated just before going into the oven, add 2 or 3 minutes per pound.