Put grape juice, lilac berry juice and 150 ml water in a pot, heat up. Hang the tea bags in the juice and let them steep for about 5 minutes. Drain the ginger plums and collect the syrup.
Finely chop the ginger plums. Divide into 4 glasses and pour 1 tablespoon of ginger syrup over each. Pour on the punch. Wash the elderberries, drain a little and roll in sugar. Decorate glasses with it.