Bring a large pot of salted water to a boil.
Heat large frying pan on low heat.
Once water is boiling, place 12 pierogi at a time in the water.
When the pierogi float to the top, cook them for one minute more.
As soon as the pierogi float to the top, and a small amount of butter to the frying pan; it should be melted by the time the minute is up.
Remove pierogi from pot with slotted spoon and place directly in frying pan.
Stir to coat with butter.
Turn pierogi over, stir again, and remove from frying pan.
At this point, pierogi can be served or cooled and then frozen in ziplock bags.