For the Sacher cake, melt the chocolate, separate the eggs. Beat egg whites with granulated sugar until stiff. Cream soft butter, stir in melted chocolate, stir in powdered sugar, vanilla sugar and salt. Gradually stir in yolks. Finally, carefully fold in snow and flour.
Pour the batter into the prepared cake pan (greased and floured) 26 cm. Bake the cake at 175 °C for about 55 minutes. When the cake is cold, cut through once and fill with apricot jam. Bring whipped cream to the boil very briefly.
Stir in the chopped chocolate and squeeze out the soaked gelatine and add to the chocolate. After about 5 minutes, stir in pieces of butter.
In a cold water bath, stirring occasionally with a pastry spatula, warm the remaining jam and brush all around the cake and glaze the Sacher cake in a glaze.