Bring 75 g sugar, vanillin sugar, 1⁄2 l fruit juice and half berries to the boil. Mix starch and rest of juice and stir into the boiling fruit mixture. Bring to the boil and simmer for 2-3 minutes while stirring. Add the rest of the berries.
Remove from heat and let it cool down. Stir from time to time.
Remove small rolls from the chocolate with a peeler. Whip the cream until stiff. Mix mascarpone, quark, 75 g sugar and vanilla sugar. Fold in the cream.
Layer berry groats and mascarpone cream in a large dessert bowl, finishing with cream. Decorate with chocolate rolls.