For the Reindling make a dampfl from milk, yeast some sugar and a few tablespoons of flour and wait until it has increased. Knead a smooth dough from all the dough ingredients and let it rise for about 1/2 hour, then beat it up again and let it rise until it has doubled in size.
Roll out the dough on a lightly floured work surface about, 1 cm thin and brush with butter and sprinkle with the remaining filling ingredients. Roll up tightly and place in a buttered large bundt pan and allow to rise for another 1/4 hr.
Bake at 180 degrees in a preheated oven for about 1 hour.
Preparation Tip:
If you wish, you can also make the Reindling without hazelnuts or use other nuts instead of hazelnuts.