Polish Żurek is traditionally prepared for Easter. In some Polish families White Borsch is cooked instead of Żurek, the difference is Kvas/ sourdough that is used. For Żurek- rye sourdough, for Borsch – wheat sour starter.
If you plan to cook traditional polish Żurek, few days before you need to prepare sourdough/Kvas/sour starter: http://cookinpolish.com/sourdough-for-sour-soup-zakwas-na-zurek/.
