Soak gelatine in cold water for about 5 minutes
Mix yoghurt, lemon juice, sugar and vanillin sugar. Squeeze out the gelatine and dissolve carefully at low heat. Stir 3 tbsp. yoghurt into the gelatine, then stir everything into the rest of the yoghurt. Chill for 10-15 minutes until the yoghurt begins to gel
Halve the soft persimmons, spoon out the flesh and mash briefly if necessary
Whip the cream until stiff and fold into the yoghurt. Layer yoghurt mousse and kaki puree in 4 glasses. If necessary, pull through spirally with a wooden skewer. Chill for about 1 hour. Decorate with kaki slices and mint