Once you've gone through heart, take the next step and have tongue. Don't knock it till you've tried it! Take any beef stew recipe and replace the beef with chunks of tongue (you'll need to skin the top layer off first though - not pleasant!); stew for 2-3 hours minimum and add 1 bottle of Guiness per litre of stock added. The most tender stewed meat you will ever eat in your life - guaranteed.
Alternatively, just slice it real thin, skewer it, salt&pepper and quick grill on the barbie.. !drool: