No kidding. As soon as I saw the thread title, I knew there was going to be at least one of the ubiquitous, “No sauce is necessary!” comments. Super helpful, Fellas.
I’m trying to think through a way to do this ahead, as it’s my favorite sauce with filet. Sweat some minced shallot in butter, then degalze with a little cognac. Add some dijon mustard and beef stock (and a little herb like thyme if you’d like) and reduce. It might work reheated…can’t think of why not.