Roast Fillet of Beef with Mustard Butter

• 1 (2½ lb) (1 kg) piece beef fillet
• 1–2

This is a joint to prepare for a dinner party. It is easy to carve and there is very little waste.

Ask your butcher to cut the piece of meat from the thick end of the fillet if possible. Then ask him to trim away all excess fat and tie the meat into a neat shape. Since all the fat has been removed from the joint, the meat must be protected during roasting with extra fat, otherwise the m