Thanks Riverwalk - we love it too.
I've looked it up on Wiki and there's an interesting sideline:
"In Polish Catholic homes, gefilte fish (Polish: karp po żydowsku) is a traditional dish to be eaten on Christmas Eve and Holy Saturday, as these are traditionally meatless feasts.[6] This follows a pattern in which a number of Jewish dishes were also eaten on Catholic religious days in Poland.[6]"
Gary Glitter programme Tuesday