First let the raspberries thaw. Mix the quark and yoghurt and sweeten with sugar to taste.
Strain almost three quarters of the raspberries through a sieve so that the kernels remain. Mix the raspberry puree with the vanillin sugar and fold into the quark.
Divide in portions into bowls and serve with the remaining raspberries. Sprinkle with chocolate flakes and, if necessary, also decorate with lemon balm.