Peel the apples lightly, cut in half, remove the cores, and grate coarsely into a bowl. Immediately add the apple juice, lemon juice, and low-fat quark, then mix well.
Stir in the honey and add sugar or sweetener to taste.
Stir the room-temperature QimiQ until smooth, add to the apple mixture, and mix well.
Divide among dessert bowls and refrigerate for at least 2 hours.
Just before serving, dust with cinnamon if desired.