Ingredients CardPierogi Ruskie27.5 pierogi · about 1 kg Potato and Cheese Filling 9 ozfloury potatoes, peeled5.5 ozlarge onion, finely chopped1 tbspbutter5.5 ozfull-fat twaróg (Polish farmer's cheese)¼ tspsalt¼ tspground black peppersalt for the potato water, to taste Dough 2 cupsall-purpose flour¼ tspsalt8 ½ tbsphot water2 tbspcanola oil Shaping, Boiling and Frying ½onion, chopped1 tbspbutter17 cupswater for boilingsalt for the water, to taste