For the dough, beat the fat, sugar, salt and 1 packet of vanilla sugar with the whisk of the hand mixer until foamy. Add the eggs one by one and stir in. Mix flour, cornstarch and baking powder and stir into the fat egg mass. Stir in milk. Pour the dough into a greased springform pan (26 cm Ø) with a tube bottom insert and spread it smooth. Bake in a preheated oven (electric: 175 °C/ gas: level 2) for 40-45 minutes.
Remove from the oven and allow to cool slightly on a grid in the baking pan. Then remove from the mould, turn over and let cool on the grid. Cut through the cooled ring twice. Spread the lower base with jam. Mix the cappuccino powder and 3 tablespoons of hot water so that the powder dissolves completely. Whip 4 cups of cream in portions with the whisks of the hand mixer until stiff, pouring in sauce powder and remaining vanilla sugar. Pour the whipped cream into a large mixing bowl and gradually add the dissolved cappuccino powder. Spread about 1/5 of the cream on the jam. Place the middle cake layer on top and spread with the second fifth of the cream. Place the lid on top and spread the rest of the cream all around. Put the wreath in a cool place for about 2 hours. Whip the rest of the cream with the whisks of the hand mixer until stiff.
Pour the whipped cream into a large mixing bowl and gradually add the dissolved cappuccino powder. Spread about 1/5 of the cream on the jam. Place the middle cake layer on top and spread with the second fifth of the cream. Place the lid on top and spread the rest of the cream all around. Put the wreath in a cool place for about 2 hours. Whip the rest of the cream with the whisks of the hand mixer until stiff. Pour into a piping bag with a perforated spout and spray very small circles onto the wreath. Place a cocktail cherry in each wreath and sprinkle with pistachios