Best sandwich idea ever?

Could this be the best sandwich idea ever? It's pretty simple to do...first cut a hole in and hollow out a big round loaf (keep the "lid" bit). Fill the sandwich with your favourite fillings. This one's got steak, ham, mushrooms and cheese. Put the lid back on it and wrap it in foil... Squish with some heavy weights for about 4 hours... Remove weights, unwrap and enjoy (sharing with friends is optional)