Warm up the milk. Mix yeast, 1 tablespoon sugar and milk. Mix flour, 75 g sugar, vanillin sugar and salt. Knead in the yeast milk. Add softened butter and egg yolk, also knead in. Cover and leave to rise in a warm place for about 1 hour. Grate chocolate.
Knead fruit mix, citronate and chocolate into the dough on a work surface generously sprinkled with flour. Form into a roll, divide into 12 pieces and shape into balls. Grease the moulds and dust with flour. Place the balls inside. Leave to rise for 30 minutes. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 20 minutes. Leave to rest for a short time, dust with icing sugar and serve decorated with small biscuits