Soak gelatine in cold water. 1 ##Lemon## wash thoroughly and finely grate the peel. Squeeze lemons and mix with sugar until dissolved. Squeeze the gelatine and dissolve in a saucepan over low heat. Add lemon juice and mix. Stir the lemon juice-gelatine mixture and lemon zest into the grape juice. Chill for about 1 hour until the jelly is firm. Cut the rind of the mangosteen all around "at the equator" of the fruit without damaging the pulp.
Lift off the upper half of the rind and now remove the segments from the lower half with a fork. Remove the large seeds in the thicker segments, the small seeds in the smaller segments can be eaten. Chop the pistachios. ##Jelly## stir briefly with a whisk and place in 4 deep plates or bowls. Spread mangosteen and possibly raspberries (pictures 02 + 03) on top and pour on some Prosecco. Sprinkle with ##pistachios## and decorate with melissa. Serve immediately
Waiting time approx. 45 minutes