Soak gelatine in cold water. Mix port wine, lemon juice and 50 g sugar until the sugar is dissolved. Squeeze out the gelatine and dissolve in a saucepan over low heat.
Add port wine bit by bit while stirring. Chill. Whip cream and vanillin sugar until stiff. As soon as the port wine begins to set, fold in the cream evenly. Pour into dessert glasses and allow to set in the fridge for approx. 1 hour.
Defrost some raspberries on kitchen paper to garnish. Sprinkle the rest of the raspberries with remaining sugar and defrost. Puree raspberries sprinkled with sugar and pour over the cream and spread the remaining raspberries on top.
If desired, serve decorated with lemon balm.