Beat egg yolks well; add sour cream, rum, vanilla, baking powder, and salt. Mix all together. Now, gradually add the flour. Knead dough about 30 minutes until it is easy to work with. Roll dough out thin and cut into strips of 1 1/2 inches wide and 3 inches long at an angle, rather than straight edge. Cut slit in center of each strip; draw one end of pastry through slit. Fry in hot deep fat until light golden color. Drain on absorbent paper.
When cool, sprinkle with powdered sugar. Yields: about 4 dozen.
