Oh! That's true, I recall that now, it's part of how he introduces Black Ribboners, IIRC? So there are definitely Jews in Ankh-Morpork, and I would love to get something about them! Maybe about the kosher butcher and their increasing number of vampire customers? (And I bet there is at least one Jewish golem in Ankh-Morpork then, and I bet said golem and Dorfl have very interesting theological discussions.)