Grease the fat pan of the oven (32 x 39 cm). Beat eggs, cream, 100 g sugar, vanilla sugar, lemon peel and salt with the whisks of the hand mixer until the sugar is dissolved.
Mix flour and baking powder, stir in briefly. Pour into the fat pan and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 10 minutes. Melt butter, add 100 g sugar and almonds and bring to the boil while stirring.
Spread the groats and almond paste as a blob on the cake. Bake at the same temperature for another 18-20 minutes. Let it cool down for about 1 1/2 hours. Serve cut into pieces.