1. Preheat the oven to 200C/gas mark 6
2. Quickly sear all sides of the fillet in a hot frying pan.
3. Then place in oven and cook for:
Rare = 25 Minutes Per Kilo
Medium = 31 Minutes Per Kilo
Well Done = 37 Minutes Per Kilo
4. Remove the joint from the oven and rest for 20 minutes before carving.
Please Note, the above is only a guide and ovens may vary in temperature.