This place, about an hour southwest of Frankfurt, has the best steaks I've ever had in my life, and that is no exaggeration. Their signature offering is 'ochsenfilet am stuck' which they bring out raw on a platter when ordering. You tell them how much you want, and how you want it cooked and it comes out exactly so. PM me if you want details.

http://www.burgschaenke-neuleiningen.de/