Pour flour on a work surface, make a depression in the middle, add sour cream. Spread butter in flakes on the edge of the flour and knead with your hands to a smooth dough. Wrap in foil and chill for about 45 minutes. Then roll out the dough on a floured work surface approx. 0.5 cm thick. Cut out circles (6 cm Ø). Cut out circles (2.2 cm Ø) from the middle of each circle to form rings.
Whisk egg yolk and 2 tbsp. water. Brush one side of the rings (carefully, as the dough is very tender) with egg yolk first, then press the side into the sugar crystals. Place the smooth side on 3 baking trays lined with baking paper. Bake one after the other in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: stage 2) for 18-20 minutes. Remove the cringles from the oven and let them cool down on a cake rack
Has the cold already hit you? According to Finnish studies, vitamin C ensures that we get back on our feet more quickly. Even a medium-sized orange covers our daily requirements.