Ingredients CardPierogi Ruskie55 pierogi · about 2.1 kg Potato and Cheese Filling 500 gfloury potatoes, peeled300 glarge onion, finely chopped2 tbspbutter300 gfull-fat twaróg (Polish farmer's cheese)½ tspsalt½ tspground black peppersalt for the potato water, to taste Dough 500 gall-purpose flour½ tspsalt250 mlhot water4 tbspcanola oil Shaping, Boiling and Frying 1onion, chopped2 tbspbutter4 lwater for boilingsalt for the water, to taste