Mix lemon juice, vanillin sugar and pear syrup. Mix yoghurt and cinnamon. Roast the hazelnut flakes in a pan without fat until golden brown. Wash and drain the grapes, pluck them from the stalks and cut them in half.
Wash the pear, quarter it and cut out the core. Cut the pear into slices. Mix grapes, pear and marinade, fill into 4 dessert bowls. Spread yoghurt on top. Sprinkle with cinnamon and hazelnut leaves.
Decorate with mint.