with skwarki... it's made of smalec, little bit of salt (and maybe add some onion if you like)...
You forgot the bacon, girl. That's what makes it! :)
Personally, nothing beats cheese pierogi for me dripping with butter, boiled or pan fried. That's it. I like the others too, but I will gladly pass them for cheese. Cheese, cheese, cheese. And, don't forget the cheesecake. The real one, from farmer's cheese, raisins, fried orange peel, and 27 sticks of butter (ok, just kidding). The works! lol.