Sift the flour.Chop the butter and rub it into the sifted flour. Mix till it resembles coarse crumbs.
Gradually add and stir in the sour cream.
Knead the dough with your hands thoroughly. The dough should be soft, moist, and elastic.Add more flour if the dough is sticky.
Cover the dough with plastic wrap and refrigerate (approx. 2-3 hours).
Divide the dough into 3 pieces.
Roll the first piece out on a floured surface. The dough should be 0.1-inch-thick. Cut in into squares (approx.. 2.5 x 2.5 inches).
Brush one side with black currant jam and roll it up from corner to corner.
Bend the tube into a crescent. Pinch the edge into the roll.
1.Repeat with the remaining squares. Do the same for the two other portions of dough.
Arrange the kiflyky on a baking sheet covered with baking paper and bake in a preheated oven at 410-430 °F (approx. 15-20 minutes).
When the cookies have cooled slightly, sprinkle them with powdered sugar. Enjoy!