Peel, quarter and core the apples. Cut 4 slices from one quarter for decoration and cut the remaining quarters into rough cubes. Crumble the Amarettini, except for some for decoration. Wash lemon balm, shake dry, pluck leaves from the stalks and cut into strips, except for 4 leaves for decoration.
Caramelise the sugar in a pan, deglaze with lemon juice, add the apple cubes and cinnamon and simmer for about 10 minutes to make a compote. Let it cool down, remove the cinnamon stick. Stir amarettini and lemon balm into the yoghurt.
Fill yoghurt into glasses, add compote. Decorate with amarettini, apple wedge and lemon balm.