Soak gelatine in cold water. Drain the peaches and collect the juice. Cut peaches into slices. Heat 75 ml water, peach, lemon and elderberry juice. Dissolve sugar in it. Squeeze the gelatine, dissolve carefully and stir into the warm liquid.
Fill half of the peach slices into glasses. Fill up with the elderberry juice. To gel, chill for about 3 hours until the dessert is completely gelled. Whip the cream until stiff, allowing the vanilla sugar to trickle in. Pour into a piping bag with a small star-shaped spout and decorate the jelly. Cover with remaining peach wedges and serve