Let raspberries thaw slightly for about 15 minutes. Separate the eggs. Mix egg yolks, vanilla sugar and sugar with the whisk of the hand mixer until creamy. Wash lemon and orange hot, grate dry and finely grate the peel.
Stir in ground almonds, cinnamon, lemon and orange peel. Beat the egg white in 2 portions until stiff and fold in. Mix raspberries into the dough.
Put the dough into a greased, square springform pan (24 x 24 cm) and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 45-55 minutes.
Take out and let it cool down for about 2 hours.
Roast almond kernels in a pan without fat for 2-3 minutes, remove, let cool and chop. Dust the cake with icing sugar and sprinkle with chopped almonds.