Put flour, sugar, vanillin sugar and salt into a mixing bowl and mix. Press a depression in the middle. Warm the milk slightly and dissolve the yeast in it. Pour into the bowl, mix with some flour and leave to rise in a warm place for about 15 minutes.
In the meantime, wash the currants, drain them and, with the help of a fork, remove them from the panicles and turn them in flour. Melt the fat and let it cool slightly. Add eggs and fat to the pre-dough and knead with the dough hooks of the hand mixer for about 5 minutes.
Add the currants and briefly knead. Grease a ring cake tin (approx. 2 litres capacity) and sprinkle with breadcrumbs. Pour in the dough, cover and leave to rise in a warm place for 30-45 minutes.
Bake in the preheated oven (electric: 175 °C/ gas: level 2) for 60-65 minutes. If necessary, cover 15 minutes before the end of the baking time. Leave to cool on a cake rack and turn out of the tin.
Dust thickly with icing sugar and decorate as desired with currants. Results in about 16 pieces.