Mix the quark and sour cream and mix with a little fruit juice from the pineapple and mandarins until smooth and creamy. Stir in lemon zest, lemon juice, sugar and vanilla sugar. Finally, carefully fold in the fruit.
Pour the quark dish into a bowl and garnish with pieces of fruit.
The fruit is interchangeable, but cherries and strawberries are not cheap because they give off too much color.