Sort raspberries or let frozen raspberries thaw. Divide between 4 glasses.
Squeeze the lemon and make a cream with the juice, quark, mascarpone, sugar and bourbon vanilla sugar. Add about 5 tablespoons of milk as needed so that the cream is not too runny.
Spread over the glasses.
Coarsely grate the chocolate or use a peeler to slice the shavings and spread over the cream.