Food / Polish Dinner for Boyfriend - what to cook? [34]

I have been dating my boyfriend for quite some time. He is Polish and I am American. He has been working with me on the language and although I know he loves me I feel like this would go along way showing I respect where he comes from and am interested in learning more as well as incorporating his Polish traditions in our future. I am at a loss of what to cook. I am somewhat of a beginner chef, but really excited to do this! Any and all help is appreciated, thank you!