Cut the melon into slices and set aside 250 g. Remove seeds from the flesh and dice coarsely. Put it in a large bowl with lemon juice and vanilla sugar and puree it finely with a hand blender.
Chill for about 30 minutes.
Roast the almonds in a pan without fat until golden brown, take them out. Wash the currants, strip them from the stalks and drain them. Wash apricots, halve, stone and cut into slices.
Crumble the rusk. Remove seeds from the remaining melon, cut from the skin and dice very finely.
Mix melon puree with grape juice. Add melon cubes. Mix crème fraîche and orange juice. Serve the melon gazpacho with a dash of crème fraiche. Decorate with lemon balm. Add apricots, currants, flaked almonds and rusks and sprinkle over the gazpacho for eating.