Ingredients CardPierogi Ruskie55 pierogi · about 2.1 kg Potato and Cheese Filling 1.1 lbfloury potatoes, peeled10.5 ozlarge onion, finely chopped2 tbspbutter10.5 ozfull-fat twaróg (Polish farmer's cheese)½ tspsalt½ tspground black peppersalt for the potato water, to taste Dough 4 cupsall-purpose flour½ tspsalt17 tbsphot water¼ cupcanola oil Shaping, Boiling and Frying 1onion, chopped2 tbspbutter17 cupswater for boilingsalt for the water, to taste