Ingredients CardPierogi Ruskie55 pierogi · about 2.1 kg Potato and Cheese Filling 500 gfloury potatoes, peeled300 glarge onion, finely chopped30 mlbutter300 gfull-fat twaróg (Polish farmer's cheese)2.5 mlsalt2.5 mlground black peppersalt for the potato water, to taste Dough 500 gall-purpose flour2.5 mlsalt250 mlhot water60 mlcanola oil Shaping, Boiling and Frying 1onion, chopped30 mlbutter4 lwater for boilingsalt for the water, to taste