This raspberry mousse cake with hazelnut crust is a rich and nutty dessert that is perfect for any dinner party. To make the cake, you will need to prepare a hazelnut crust using crushed hazelnuts and melted butter. Then, you will need to make the raspberry mousse by blending fresh raspberries, sugar, and whipped cream. Once the mousse is ready, pour it over the hazelnut crust and refrigerate for a few hours until set. Serve the cake chilled with fresh raspberries on top.