Get the cheddar kind. Fry them in a pan but add a splash of water and put a lid on it. Then when they are tender and hot grate cheese onto them, stick them in the oven on top rack/top burner at max and melt the cheese till it is crispy. Then add salsa and sour cream.
put em in boiling water till they float. Meanwhile melt a stick of butter on the stove, then get some onions. chop em up, put em in the butter, then add the pierogis in the butter/onion mix. SSOOOOO good.
It's been said before, and I'll reiterate because melted lard/butter and bacon bits with sautee'd onion are the best way to go. No better way, this is how my grandmothers (both Polish) made them, and this is the way I will continue to eat them.
UNLESSSSSS- you have made your pierogi with fruit inside, not meat or potato. Try it if you haven't- make the same exact dough, and just put in cherries, or slices of apple, or raspberries, pretty much anything you want. Then eat them either just by themselves, or with a bit of sugar. Definitely a good desert.