Place frozen raspberries in a large (or 2 medium-sized) bowl (s).
Mix natural yoghurt with mascarpone and low-fat quark, fold in the whipped cream. Put the quark and cream mixture on the raspberries and sprinkle everything thickly (!) With brown sugar. Do not stir in the sugar!
The layered food should then sit overnight in the refrigerator, during which time the sugar layer will form a kind of crust.
Before serving, melt the butter with 2 tablespoons of sugar in a small pan. Brown the almond sticks in it. Then spread on some greased aluminum foil or a plate. Let it get cold and put on top of the layered dish.