Peel oranges so that the white skin is completely removed. Remove the fillets between the parting skins. Cream fat, sugar, salt and vanilla sugar with the whisk of the hand mixer. Stir in eggs bit by bit. Mix flour, baking powder and starch.
Alternately stir in 5 tablespoons of lemonade. Carefully fold orange filets into the dough. Pour the dough into a greased and flour-polluted box form (1 1/2 litre capacity). Brush smooth. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 55-60 minutes. Cover after 45 minutes if necessary. Remove the cake from the oven and let it cool down for 10 minutes. Turn the cake onto a cake rack and let it cool completely. Stir icing sugar and 3 tablespoons of orange lemonade until smooth.
Cover after 45 minutes if necessary. Remove the cake from the oven and let it cool down for 10 minutes. Turn the cake onto a cake rack and let it cool completely. Stir icing sugar and 3 tablespoons of orange lemonade until smooth. Cover the cake with icing. Let the icing dry and decorate with candied orange slices
waiting time approx. 2 hours