What a marvellous episode, the absolute master, Koffmann. He is such a kind mentor. In a mad moment a few years ago I made a couple of these with all the mousse, sweetbreads and morels etc. It is a taste and texture sensation when it is finally done, but I'm not sure I got the sauce anywhere as rich as yours and my mash wasn't quite up to snuff either. Well done guys - that's one for the memories.