Wash the orange, rub dry and thinly grate the peel. Cut the vanilla pod in half lengthwise and scrape out the pulp with the back of a knife. Separate 4 eggs. Beat the egg whites and 3 tablespoons of cold water with the whisk of the hand mixer until stiff, adding sugar and salt. Stir in egg yolks, orange peel, vanilla pulp and liqueur.
Mix almonds, flour and baking powder, sieve in portions onto the egg mixture and fold in. Line the bottom of a springform pan (26 cm Ø) with baking paper. Fill in sponge mixture and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) on the middle shelf for 20-25 minutes. Sprinkle almonds on the cake about 5 minutes before the end of baking and continue baking. Remove from the oven and place on a cake rack. Remove the cake from the edge of the springform pan. Let it cool down in the tin, take it out. Dust the cake with icing sugar before serving.
Sprinkle almonds on the cake about 5 minutes before the end of baking and continue baking. Remove from the oven and place on a cake rack. Remove the cake from the edge of the springform pan. Let it cool down in the tin, take it out. Dust the cake with icing sugar before serving. Whipped cream tastes good with it
45 minutes waiting time