For a Polish soup, my favourite is krupnik.
Have you ever had czernina? I tried it and loved it. Had it a few times before I found out it's made of duck blood and a broth that's made by boiling duck gizzards and duck neck. Still liked it. I later found out it was traditionally served to a young man as a sign that if he asked for permission to marry a daughter of the family, he'd be knocked back (or if he had asked, the answer was no).

