Earlier quoted context omitted.
Polish cuisine is very similar to German cuisine. (This comment will make a lot of Polish people very upset.)
I don't see why. A lot of Western Poland used to be German, and it's not like there's one German cuisine either. You don't get many Bavarians eating pickled herring with beets, but's it's classic cuisine in Berlin.
Also, you'd be surprised at how widespread pickled herring is in Bavaria. Herring has been a trading good for millennia in Europe, was and is still consumed in the winter months in Bavaria. You can easily get a "Fischsemmel" at the Oktoberfest in Munich. Bavarians also used to pickle everything for the winter: cucumbers, beets, cabbage, beans.