Put the frozen raspberries in a bowl and defrost for about 1 hour. Chop the chocolate and melt over a warm water bath. Dip about 17 sponge cakes about halfway into the chocolate, place on baking paper and allow to dry.
Mash the defrosted raspberries. Soak gelatine in cold water. Mix cream cheese, quark, sugar and liqueur. Stir in raspberry puree. Whip cream until stiff. Dissolve the gelatine, mix with 5 tbsp of the raspberry cream, stir into the rest of the cream.
Carefully fold in the cream.
Place dipped sponge cakes on the edge of a springform pan (20 cm Ø), line the bottom of the pan with sponge cakes. Spread raspberry cream on top and smooth it down. Chill for at least 2 hours.
Use remaining sponge cakes for other purposes.
Carefully remove Charlotte from the mould and place her on a cake plate. Select the raspberries, spread them on the Charlotte and dust with icing sugar.