Food / Help with Polish recipe - Żurek soup? [25]

All 4 of my grandparents came to the US from Poland. Both of my parents spoke Polish, especially when they didn't want us kids to understand what they were saying. Consequently we learned little Polish - just a few niceties, and some not so nice words.

Anyway, at Easter-time my mother would make this cheese from dry curd cottage cheese. She would place it in cheesecloth and then press it between two heavy rocks for a day or so. It was a tart, crumbly cheese that we would put in our soup with broth made from cream and the kielbasa water. We'd also add kielbasa, hard boiled eggs, horseradish, and pieces of rye bread. If I recall correctly she called it "siteh", or something like that.

My mother has been gone for several years now, and sadly this recipe died with her. As I've gotten older I've become nostalgic for some of the foods from my childhood, and this is one of them.

Does anyone know what this cheese is called and how to make it?

P.S. Sorry for writing such a long post.