The Sake Steak sounds wonderful, but I do not understand what cut of meat the "fillet steaks" are? Is it a filet mignon, or some form of rib eye steak?
Nigella's Sake Steak And Rice (from FEAST) is a luxurious dinner for two made with fillet steak. This steak is very tender and comes from the tenderloin, in the US this cut of steak can be called filet mignon, and in France filet de boeuf. The steak is marinated in a spicy, savoury mixture before cooking and then served with a pan sauce made with sake.
The marinade and sauce would also go well with duck or chicken breasts. You could also use the UK steak called sirloin steak as an alternative, in the US the equivalent cut of beef is called New York strip steak, Kansas City strip steak or top loin steak.