Put the raspberries in a bowl and let them thaw. Set aside some nice raspberries for decoration. Roughly chop the chocolate and melt over a warm water bath. Mix chocolate and yoghurt. Whip the cream until creamy.
Fold in chocolate yoghurt. Puree half the raspberries and fold into 1/3 of the chocolate mixture. Fold the remaining raspberries into the white cream. Fill both masses alternately into a bowl. Decorate with the remaining raspberries and lemon balm
With 10 people: