Finely grind the millet in a flour mill or in a universal chopper. Place the millet and flour, crumbled yeast, honey, salt, cinnamon, rum and the egg in a large bowl. Warm the milk slightly, melt the fat in it.
Wash the raisins and currants and dab dry, add to the flour together with the milk-fat mixture. Mix everything with the dough hooks of the hand mixer to a smooth dough. (The dough should come off the bowl rim.) Cover the dough and let it rise in a warm place for about 30 minutes until it has visibly increased in size.
In the meantime, knead hazelnuts, honey, cream, salt and cinnamon for the filling. Roll out the dough to an oval about 2 cm thick on a lightly floured surface. Shape the filling with wet hands into a roll the length of the pastry sheet and place on top in the middle.
Whip one side of the dough over it so that the nut mixture is covered and the typical stollen shape is created. Place on a baking tray lined with baking paper and leave to rise for another 15 minutes.
Bake in the preheated oven (electric oven: 225 ° C/ gas: level 4) for the first 10 minutes. Then set the temperature to (electric oven: 175 ° C/ gas: level 3) and bake the stollen for another 50 minutes.
To spread, melt butter and stir in honey and rum. Prick the still warm stollen all around and spread with the rum-honey-butter. Let the nut stollen rest for 2-3 weeks wrapped in aluminium foil.
Results in about 40 slices.