Vatrushka
Vatrushka (Russian: ватрушка [vɐˈtruʂkə] ) is an Eastern European pastry (pirog), characterized by a ring-shape of dough with traditional white cheese Tvorog in the middle, sometimes with the addition of raisins or bits of fruit. The most common size is about 5–10 cm (2–4 in) in diameter, but larger versions also exist.