Heat the cream in a saucepan and remove from the heat. Melt the nougat mass while stirring until a smooth, even nougat mass is formed. Put the mixture into a mixing bowl, let it cool down and put it in a cool place for about 3 hours.
Mix butter, sugar, 50 g icing sugar and egg white in a mixing bowl. Mix flour and cocoa and knead in quickly with the dough hooks of the hand mixer. Wrap the dough in foil and refrigerate for about 1 hour.
Roll out the dough on a floured work surface and place it in a greased tart tin with a twist-off base (26 cm Ø), lifting the rim and pressing firmly. Cover the dough with baking paper, spread dry peas on top and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see
manufacturer) Bake for 20-25 minutes. Take out, remove dry peas and baking paper. Let the base cool down on a cake rack for about 1 hour.
Soak gelatine in cold water. Sort 125 g raspberries, puree and mix with raspberry jelly. Squeeze out the gelatine, dissolve and stir in 2 tbsp. raspberry puree, stir into the rest of the raspberry puree.
Spread the raspberry puree on the base and let it gel for about 30 minutes.
Whip the nougat cream until creamy with the whisk of the hand mixer. Spread the cream on the raspberries and smooth it down. Chill the tart for at least 4 hours (preferably overnight).
Remove the tart from the mould and place on a plate. Sort 125 g raspberries and place them in the middle of the tart. Dust with icing sugar just before serving.