Beat the eggs, 225 g sugar and 1 packet of vanilla sugar until frothy. Stir in the oil and mineral water. Mix the flour and baking powder and fold in. Spread the dough on a greased baking sheet and bake in the preheated oven (175 ° C) for about 20 minutes. Take the cake out of the oven and let it cool down.
Drain the mandarin oranges. (Roast the almond sticks in a dry pan and let them cool.) Whip the cream until stiff, pour in the remaining vanilla sugar. Fold the sour cream under the whipped cream. Set aside 2 tablespoons of drained mandarin oranges to garnish. Spread the rest of the mandarin oranges on the cake, pour the cream and sour cream mixture on top and spread on it. (Sprinkle with almond sticks.) Mix the cinnamon and remaining sugar and sprinkle on the cake. Garnish with the remaining mandarins.