Roughly chop the meringue pieces and distribute them evenly in a baking dish, then distribute the frozen raspberries on the crushed meringue.
Mix the mascarpone, low-fat quark and yoghurt into a cream until everything is a medium-strength cream. If the cream is too firm, just add a little cream. Spread the cream evenly on the raspberries as a 3rd layer and spread it on, finally sprinkle brown sugar over the cream so that it looks like it has been glazed. The whole thing is then put in a cool place.
The cream is best if you have it in the fridge for about 3 hours, because the meringue then still has a bite and is not softened by the raspberries, of course you can still enjoy the dessert after a longer cold period.