Beat the eggs with the sugar, add the oil, milk and pre-sifted and mixed together flour with baking powder.
Pour the mixture into an oiled tray and bake in a preheated 356°F (180 °C) oven until ready. While still hot, cut the cake and pour the hot sauce over it.
For the sauce, put the water to boil with the sugar, vanilla sugar, cocoa and butter. Once all the products are melted and homogenized, pour it over the cake.