This is a type of Hungarian doughnut

Found in recipe booklet from the Milk Industry Foundation, Washington, DC

beat egg yolks and sour cream together until well blended

add all or enough flour to form a soft dough

knead until smooth

roll out very thin

cut into diamond shapes

cut slit in center of each diamond

pull one end thru each slit

fry in oil until light brown

drain, then dust with powdered sugar

enjoy