For the birthday nougat cake, separate the eggs, beat the egg whites with 2/3 of the sugar until stiff.
Beat the yolks with the remaining sugar, vanilla sugar and the coffee powder dissolved in a little hot water until very foamy.
Fold the yolk mixture and the flour into the beaten egg white at the same time. Pour the mixture into a buttered, sprinkled cake pan and bake at 190°C for about 45 minutes.
After cooling, cut through 2 times. Cream butter with sugar, rum and melted nougat.
Heat the apricot jam, spread it on the cake layers, fill with 2/3 of the cream and assemble.
Spread the rest of the cream around the edges and on the surface of the cake and sprinkle with grated almonds.
Pour a small amount of the cream into a pastry bag with a star-shaped nozzle and pipe rosettes. Place an almond on each rosette.
Serve the birthday nougat cake.