Fishetarian

'Okay, we can't do monkfish for the fishetarians because it's not kosher, and the koshers won't eat red meat either, so cod will do for them[…]

Uncle Murray is on a very strict heart healthy diet. Katherine may be a fishetarian — she has some sort of ulcer-thing I think, because I know that eating much in the way of tomatoes is a no-no for her.