As a matter of fact, whether you're preparing filet mignon ... sauce, combine steak drippings with wine or stock over medium heat until reduced. Then, off the heat, whisk in a bit of mustard.

Rub the fillet of ... in the wholegrain mustard. Chill until ready to serve alongside the beef. Carve the beef into thin slices just before serving. Both the beef and the sauce can be prepared ...