What is the authentic way to cook pierogi? I've been buying pre-packaged pierogi from Trader Joe's and local Polish delis. But I can't seem to get a straight or consistent answer on how you are supposed to cook them. Should you steam pierogi, boil them, or saute them with butter?
We have a Polish &amp; Greek place by us (don't ask), and theirs are always boiled.  They are delicious that way (usually topped with bacon and sour cream)... 

Personally I always grew up w/ them boiled then sauteed, which is my favorite.