Blue cheese sauce
1.Preheat oven to 220°C.
2.Tie beef with kitchen string at 2cm intervals; season. Melt butter in a heavy baking dish; cook fillet until browned all over.
3.Add brandy and roast in oven 18 minutes, basting frequently. Remove from oven; cover and stand until cool. Place roast on a piece of plastic wrap. Sprinkle with herbs; roll to coat. Enclose in plastic wrap; leave at room temperature for up to 2 hours before serving.
4.Meanwhile, to make blue cheese sauce, combine ingredients in a medium bowl and season.
5.Serve beef sliced with blue cheese sauce.