Mix quark, eggs, salt, 150 g sugar, vanillin sugar, oil and milk with the whisk of the hand mixer. Mix the flour and baking powder and gradually stir into the quark mixture with the dough hooks of the hand mixer.
Roll out the dough into a rectangle (60 cm x 50 cm) on a well floured work surface. Melt the butter and dissolve the remaining sugar in it. Spread the rolled out dough with it and sprinkle with dried Caribic fruits.
Roll up the dough sheet from the long side. Cut the dough roll into 20 slices and place the slices next to each other on a well-greased fat pan of the oven. Bake in the preheated oven (electric oven: 175 °C/ gas: level 2) for 30-35 minutes.
If necessary, cover with aluminium foil shortly before the end of the baking time. Mix icing sugar, lemon juice and 2 tablespoons of hot water. Spread it with a brush on the warm cake. Results in about 20 pieces.