Wash, clean and halve the strawberries and sprinkle with 75 g sugar. Mix yoghurt, quark, remaining sugar, vanillin sugar and sour cream. Fold 3/4 of the chocolate into the yoghurt quark cream.
Pour the strawberries into a glass bowl. Pour yoghurt quark cream on top, sprinkle with remaining chocolate and serve decorated with lemon balm if you like.