LADY WHAT - she must have been joking, nobody would ever do that and no sensible Archduke would just leave his personal diaries in the library either.
Keltham samples everything, and will gravitate towards the more protein-heavy dishes accompanied by fruit, treating the pastries and bread as a dessert. He chews the first bites deliberately, experiencing and considering, and then eats much more rapidly after he has already Observed the New Experience.