Knead the butter in pieces, sugar, flour, vanillin sugar, fish cheese and egg first with the dough hooks of the hand mixer, then with your hands to a smooth dough. Wrap the dough in foil and chill for about 30 minutes. Halve the orange and squeeze out the juice. Coarsely chop candied orange peel, candied lemon peel and cranberries. Finely mix chopped fruit, rum and approx. 7 tbsp. orange juice in a universal chopper or with a hand blender. Roll out the dough to a rectangle (approx. 25 x 35 cm) 2-3 mm thick on a floured work surface.
Spread a thin layer of cranberry mixture on top and leave an approx. 1 cm wide edge on one long side. Carefully roll the dough up tightly from the opposite long side and refrigerate for another 30 minutes. Cut the dough roll into approx. 25 slices. Place snails on two baking trays lined with baking paper. Bake one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 10 minutes. Let the biscuits cool down on a cake rack
Waiting time approx. 1 hour