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Arrange pierogi on a greased backing sheet leaving enough space between the pierogi so they can rise. Cover with a dishtowel and let pierogi rest for about 20 minutes. Mix an egg yolk with butter and brush pierogi with this mixture.

Arrange pierogi on a greased backing sheet leaving enough space between the pierogi so they can rise. Cover with a dishtowel and let pierogi rest for about 20 minutes. Mix an egg yolk with butter and brush pierogi with this mixture.