Beat the eggs, powdered sugar and vanilla sugar until creamy, slowly pour in the oil and eggnog. Mix the flour, cornstarch and baking powder and sieve on the dough. Bake for about 25 minutes at 175 ° (make a stick test).
Bring 2 glasses of sour cherries or blueberries with 2 packets of vanilla pudding to the boil, distribute evenly on the cake and allow to cool.
Whip 2-3 cups of whipped cream until stiff and spread over it. Let threads run over it with the dissolved couverture.