Put the cream quark and yoghurt in a bowl and mix with the vanilla sugar.
Wash, quarter and core the apples and cut into bite-sized pieces. I don`t peel the apples. Peel and slice the bananas. Peel and cut the mandarins and cut the pieces in half. Drain the canned pineapple in a colander. Add the fruit to the quark-yogurt mixture and mix everything together well.