Knead the flour with the butter and the sour cream to form a dough, cut out circles (e.g. using two glasses of different sizes), moisten the circles with water - this works perfectly with a flower syringe.
Then you press the curls into the granulated sugar and place them on the baking sheet. Middle rail in the oven at 160 ° C hot air. The baking time is 15-18 minutes. The circles stay light, they shouldn`t tan.