For the dough, mix the fat, 200 g sugar and salt until creamy. Stir in the eggs one after the other. Mix flour and baking powder, alternately stir in 100 g cream. Grease a springform pan (26 cm Ø). Fill in the dough and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 25-35 minutes (stick test). Let cool on a cake rack.
Remove the base from the pan, cut in half horizontally once. Place a cake ring around the lower cake base. Soak the gelatine in cold water. Stir curd, sour cream, 100 g sugar and orange juice until smooth. Squeeze the gelatine, dissolve carefully. Stir a little cream into the gelatine, then stir everything into the rest of the cream. Beat 250 g cream until stiff, fold into the cream. Pour approx. 2/3 of the cream onto the lower base and smooth it down. Place the upper cake layer on top. Spread the rest of the cream on top. Chill for at least 3 hours. Peel the orange so that the white skin is completely removed. Cut oranges into thin slices.
Beat 250 g cream until stiff, fold into the cream. Pour approx. 2/3 of the cream onto the lower base and smooth it down. Place the upper cake layer on top. Spread the rest of the cream on top. Chill for at least 3 hours. Peel the orange so that the white skin is completely removed. Cut oranges into thin slices. Warm up the orange jam and stir until smooth. Remove the cake from the ring and place on a cake plate. Coat the edge of the cake with a piece of the jam. Place the orange slices on the edge of the cake. Cover the cake with the remaining orange slices and spread with the remaining jam. Sprinkle with pistachios and decorate with orange peel
Warm up the orange jam and stir until smooth. Remove the cake from the ring and place on a cake plate. Coat the edge of the cake with a piece of the jam. Place the orange slices on the edge of the cake. Cover the cake with the remaining orange slices and spread with the remaining jam. Sprinkle with pistachios and decorate with orange peel
4 hours waiting time