Preheat the oven to 220C/425F/Gas 7 (fan 200C). Rub the fillet of beef with plenty of salt and pepper and the oil. Heat a large frying pan until very hot. Fry the fillet on all sides until browned.
Pork fillet is very quick to cook but will soon dry out if overcooked. Remove any tough white membrane or sinew from the outside of the loin before cooking. If roasting a whole loin, stuffing it ...