Mix jelly powder and 500 ml water in a small pot and let it swell for 5 minutes. In the meantime peel the kiwi and cut it into pieces. Peel the clementines so that the white skin is completely removed.
Cut the clementines into slices. Stir the sugar into the liquid and heat while stirring constantly (must not boil) until the sugar is dissolved. Divide the fruit into four dessert glasses and pour the jelly on top.
Put the dessert in a cool place for about 6 hours. Whip the sour cream, vanilla sugar and vanilla pulp with the whisk of the hand mixer. Serve dessert with a dash of sour cream and, if desired, decorated with lemon balm and clementine corners.