I had Zapiekanka (A zapiekanka is a toasted open-face sandwich made of a sliced baguette or other long roll of bread, topped with sautéed white mushrooms, cheese and sometimes other ingredients, such as ham. Served hot with ketchup, it has been a popular street food in Poland since the 1970s) in Krakau once. it was already overrun with tourists 16 years ago, I assume that didn't change for the better.
also I met some Irish lads in the hostel and that Zapiekanker didn't stay in my stomach heh.