Javaj:
i eat pierogi at my polish girlfriend's grandmother... Just the best! i don't know the recipie though.
In some parts of Greece we have pierogi with different name, "Varenika" ""
I don't actually know what's the difference between pierogi (we call 'em "pelmeni" in Russian) and "vareniki" (derives from the verb "varit'"=to boil), but traditionally last ones are stuffed by jam (cherry, plum etc.) or curd, cheese, whereas first are always stuffed with a meat.
Once I bought in a European Shop (it's a place where ukranian and polish guys sell mostly Russian goods) in the US Polish pierogi, they were delicious. :)