Each group contained 25 cattails. All of the groups were grown in the same type of soil, they all received the same amount of light, and they were all kept at the same
Cooking at a constant oven temperature of 300Â°F (160Â°C), a 5- to 8-lb standing rib roast will take 17-19 minutes per pound for rare, 20-22 for medium rare, 23-25 minutes for medium, and 27-30 minutes for well done.ow 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.
Place the beef in a roasting tray and rub with 1 tbsp of oil. Grind the peppercorns and salt and rub over the joint. Roast at the high heat for 20 minutes. Turn the heat down to 170Â°C, gas mark 3 and cook for 12â15 minutes per 500g for medium-rare or 20 minutes per 500g for medium-well done.