Qistibi (Tatar Cyrillic: кыстыбый, Latin: qistibiy) is a popular traditional dish in Tatarstan and Bashkortostan. Qistibi is made from the roasted flat cake with various fillings inside. The dough should be non-fermented. The most popular filling is mashed potato but it may also be ragout or couscous. Filling is being placed on the one half of the flat cake and is covered by the other half. Later, clarified butter is being used to spread the surface of the flat cakes.