Beat the fat, 125 g sugar and orange zest until creamy. Stir in the eggs one by one. Mix flour, baking powder and almonds and stir in
Spread into a greased springform pan (26 cm Ø). Bake in a hot oven (electric cooker: 175 °C/ convection oven: 150 °C / gas: level 2) for 30-35 minutes. Remove from the tin, let cool down
Peel oranges with white skin. Cut 3 into 15-18 slices and drain on kitchen paper. Cut 2 oranges into pieces
Soak the gelatine. Mix buttermilk, 6 tbsp. liqueur and 50 g sugar. Squeeze the gelatine and dissolve. Stir in 2-3 tablespoons of buttermilk, then stir in the remaining buttermilk. Chill buttermilk until it starts to gel
Place the mould edge around the base. Heat the jam, mix with 2 tbsp. liqueur and spread on the base. Whip cream and 1 tbsp. sugar until stiff. Fold the orange pieces into the buttermilk mixture. Spread on the base. Place the orange slices on top. Chill for at least 4 hours.
Mix casting powder and 1 tablespoon of sugar. Fill up 2 tablespoons of liqueur with water to 1/4 l, mix with the icing powder, bring to the boil while stirring and cool slightly. Spread on the cake