Line the bottom of a springform pan (26 cm Ø) with baking paper. Separate the eggs. Beat egg whites, salt and 3 tbsp. cold water until stiff, adding sugar. Beat the egg yolks separately into the mixture. Sift flour, starch, baking powder and 2-3 tsp. cocoa into the mixture and fold in. Brush into the mould. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/gas: level 2) for about 20 minutes. Cooling down
Heat 150 g cream (do not boil!). Coarsely chop the couverture and melt it while stirring. Stir in butter and let it cool down for about 20 minutes until it thickens a bit. Close a cake ring or springform pan rim around the cake base. Spread the truffle mixture on top (do not whip!). Chill for about 2 hours
Soak gelatine in cold water. Whip 500 g of cream until stiff, allowing the vanillin sugar to trickle in. Fold in Cointreau. Squeeze the gelatine and dissolve over a mild heat. Stir in 3 tablespoons of cream one after the other, then fold into the rest of the cream. Spread on the truffle cream and refrigerate for about 4 hours
Whip 100 g cream until stiff. Pour into a piping bag with star-shaped spout. Spray cream tuffs onto the cake. Dust the cake with cocoa and decorate with mini truffles and orange peel