Not Polish, either. But I love different cuisines. This looks like it's sauerkraut, you could make Bigos with it. (Hunters stew) it's really delicious and better the next day 😋
I am not Polish but Lithuania similar cuisine
I could eat my body weight in pierogi ! They are fun to make, but time consuming. We always made them at Christmas time. 'Many hands make light work.' It goes fast when the whole family helps. They freeze beautifully too. So when you make them, make a lot all at once and freeze them!! https://www.kingarthurbaking.com/blog/2021/02/04/how-to-make-pierogi-polands-favorite-comfort-food
There are lots of recipes for these too. Everyone's family has their own riffs on it. Serious comfort food 😍 https://myownsweetthyme.com/2010/10/grams-galumpki/#wpzoom-recipe-card
https://www.justapinch.com/recipes/main-course/main-course-other-main-course/almost-my-grandpops-kapusta.html my mom made this a lot for my dad. I hated it as a kid lmao. Sometimes she would put kielbasa in it.
I second the pierogi recipe 😅
Oh get some nice sausage and roast it with fermented cabbage from this jar. Serve it with potatoes