how long do you cook a beef roast
4. Cooking Times and Temperatures. Start the beef in a very hot oven 220Â°C/425 Â°F/Gas 7 for the first 30 mins then lower the temperature to 190Â°C/375Â°F/Gas5 for the remaining cooking time based on how you like your beef when cooked. Rare - 11 mins per 450g / lb. Medium - 14 mins per 450g / lb.