Select raspberries and blackberries. Wash apricots, sour cherries and currants and drain well. Halve the apricots, remove stones and dice the flesh roughly. Stone the cherries.
Strip the currants from the panicles.
Mix the fruit with sugar, fill into a suitable container (earthenware jar with lid approx. 2.5 l capacity) and let it stand for at least 30 minutes. Then pour rum over the fruits so that the rum is standing finger-wide over the fruits (if necessary, weigh down floating fruits with a saucer).
Close the rum pot well with cling film and let it stand in a cool place for about 4 weeks.
Ice cubes and approx. 50 ml rum pot each into glasses. Decorate with lemon balm and top up with mineral water.