Divide the quark into 3 portions. Wash and clean the berries.
Puree the blackberries and raspberries separately with 30 g of sugar each. Then stir into the first two quark portions separately from each other. Mix the rest of the quark with the rest of the sugar, lemon juice and lemon zest.
Fill into glasses in layers and refrigerate until ready to serve. Serve garnished with mint and berries.