We had these pierogi for dinner tonight and they were wonderful. The dough worked so nicely, and the seams didn't open up (even though i was boiling the water more vigorously than necessary). What i had on hand, cheese-wise, was pepperjack, so i don't know how Polish that was-- but it was tasty. We ate them with fried onions and sour cream. i will definitely keep using this recipe, and have already passed it along once! i did add a bit of salt at the table, though, and i almost never do that. So next time, i'll either use a stronger-flavoured cheese (this wasn't the greatest pepperjack), or i'll add a bit of salt to the filling.

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