Beat the soft fat, sugar, vanillin sugar, salt and lemon zest until creamy. Stir in the eggs one by one. Mix flour, cornstarch and baking powder. Stir into the fat-egg mixture by the spoonful
Grease a box form (25 cm long) and line it with baking paper. Fill in the dough and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 ° C/ gas: level 2) for approx. 1 hour. Let rest for about 10 minutes. Turn out onto a cake rack. Remove baking paper, let cool down
Cut the cake into slices. Cover with drained mandarin oranges as desired and add vanilla cream with a core mixture of pumpkin, sunflower and sesame seeds