We went over for dinner at a Polish friend's house and they served these for dinner. They are fluffy, lightly sweetened buns of steamed dough filled with blueberries. When I investigated the recipe, all I could find was a Czech version. I tweaked it to be just like my Polish friend's recipe. I hope you like it! You need a steamer for this. This recipe looks wildy complicated, but it really isn't...just try it once- I could eat 10 of these things!