This raspberry mousse cake with lemon sponge is a refreshing dessert that is perfect for summer dinner parties. To make the cake, you will need to prepare a lemon sponge cake using flour, sugar, eggs, and lemon zest. Then, you will need to make the raspberry mousse by blending fresh raspberries, sugar, and whipped cream. Once the mousse is ready, spread it over the lemon sponge cake and refrigerate for a few hours until set. Serve the cake chilled with fresh raspberries on top.