Grass Fed Beef - A favourite for that special Roast Beef Dinner.
Preheat oven to 230c/210c Fan/ 450F/ Gas Mark 8.
Roast for 20 mins , then reduce temperature to 180c/Fan 160c/ 350F/ Gas Mark 4 and continue to roast.
Rare: Cook for 15 mins per 450g
Medium : Cook for 10 more minutes.
Well Done : Cook for 30 more minutes.
Allow to rest under foil for 20 - 30 minutes before carving.