For the yeast dough, melt 125 g butter and let it cool down a little. Warm the milk and dissolve the yeast in it. Put flour, 150 g sugar, eggs and salt in a large bowl. Add butter and yeast mixture, knead to a smooth dough. Cover and leave to rise in a warm place for about 1 hour. In the meantime, cut mixed fruit into small pieces.
Mix quark, 100 g sugar, vanillin sugar and pudding powder with the whisk of the hand mixer until smooth, fold in mixed fruit. Melt 50 g butter. Halve the yeast dough. Roll out each half to a square (40 x 40 cm) on a floured work surface. Brush each half with 1/3 of the liquid butter and spread half of the quark mixture on each half. Roll up yeast plates from one side, cut off end pieces, cut the remaining roll into approx. 20 pieces. Line a baking tray (32 x 39 cm) with baking paper. Place rolls of dough on top at a distance of approx. 2 cm, cover again and let rise for approx. 30 minutes. Brush with the remaining butter and sprinkle with 2 tbsp. sugar. Bake the cake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 25 minutes. Remove the cake.
Place rolls of dough on top at a distance of approx. 2 cm, cover again and let rise for approx. 30 minutes. Brush with the remaining butter and sprinkle with 2 tbsp. sugar. Bake the cake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 25 minutes. Remove the cake. Heat jam and 4-5 tbsp. water in a small pot. Spread snails with the jam
waiting time approx. 3 1/2 hours