Boil up the currant juice, 1/8 litre water, sugar and lemon juice. Mix starch and 3 tablespoons of water. Stir into the juice and boil for about 1 minute. Scald nectarines hot, rinse with cold water and peel off the skin.
Halve and stone the fruit. Cut the halves into columns. Select the raspberries and add them with the nectarine slices to the lukewarm fruit soup. Put them in a cold place. Garnish as desired with lemon balm.