Soak gelatine in plenty of cold water. Stir yoghurt, lemon juice, sugar and 1 sachet of vanillin sugar until smooth. Dissolve the gelatine at low heat. Stir into the yoghurt cream and allow to thicken slightly.
Select the raspberries, wash, drain and, except for a few for garnishing, fold them into the yoghurt cream. Rinse a box mould (20 cm long) cold and pour in the yoghurt cream. Chill for 6 hours, preferably overnight.
Lightly whip cream, liqueur and remaining vanilla sugar. Dip the mould briefly in hot water and turn it over. Decorate the yoghurt cream with the remaining raspberries, mint leaves and chocolate sticks. Serve with the mint cream.