Ukrainian
Beat the eggs with the sugar, salt and vanilla, then stir in the sour cream and the melted butter.
Add the flour gradually and knead into a firm, smooth, non-sticky dough; wrap it and rest it for 30 minutes.
Roll the dough out as thinly as possible, 1-2 mm, and cut it into strips about 4 x 10 cm.
Cut a 3 cm slit in the middle of each strip, pass one end through the slit and pull gently to make a twist.
Heat the oil in a deep pan to 175C and fry the twists a few at a time for 1-2 minutes, turning once, until light golden.
Lift them out with a slotted spoon onto paper towels to drain.
Dust the cooled verguny generously with powdered sugar before serving.