Mix yoghurt with 2 tablespoons of sugar and vanillin sugar. Line a sieve with a sheet of kitchen paper and hang in a bowl. Pour yoghurt into the sieve, cover and leave to drain overnight in a cool place. Coarsely chop the chocolate coating and melt separately on a hot water bath. First spread the dark chocolate coating thinly on a marble or porcelain board and use a cake comb to make grooves in the coating. Allow the chocolate coating to set, then spread the white chocolate coating on top and allow it to set as well.
Use a spatula or knife to push the couverture into small rolls, place them on a plate and refrigerate. Set 50 g of beautiful raspberries aside for decoration. Puree the rest of the raspberries. Pass the raspberry puree through a sieve and mix with 2-3 tablespoons of sugar. Form 8 cams from the yoghurt mass with two moistened tablespoons and arrange on 4 plates with the raspberry sauce. Serve immediately, decorated with mint leaves, raspberries and chocolate rolls