On a wooden surface, sift the flour and mix with baking powder, egg yolks, sour cream, vanilla extract, and alcohol.
Roll out into a very thin sheet of dough and cut out into 1 x 6 inch (2.5 x 15 cm) rectangles. Make a 2-inch (5 cm) slit lengthwise in the center of each strip of dough. Take one side of the dough and thread it once through the opening. Sprinkle all