This is the Frobscottle recipe from Roald Dahl's Revolting Recipe cookbook that I had as a kid. Still have somewhere, my dad scanned this in and emailed it to me. Isn't he nice? Frobscottle is another of the drinks that I am considering doing for my Fictional Beverages brief. I'm a little unsure of it though because all I can picture is Quentin Blake artwork and no other ideas seem to be coming to me. I shall have to have a think.