Place the chocolate biscuits in a frozen bag, close and roll over them with a rolling pin until the biscuits have broken down into crumbs. Pour the melted butter over it in a bowl. Allow to cool briefly and spread the mixture evenly on the bottom of a baking tray. Press firmly.

For the cream, boil milk, flour, starch, powdered sugar and eggs to form a thick pudding. Remove from heat and, while still hot, mix with butter and vanilla sugar. Melt the butter and sugar while stirring. I mixed it with a hand mixer and the cream became nice and smooth. Let it get cold.

Finally, whip the cream until stiff and stir it into the pudding with a whisk. Halve the cream.

Spread one part on the cake (cut off the edge), sprinkle the crumbled edges over it, spread the rest of the cream. Smooth it out and chill.

When the cream on the cake is really solid, the top is covered with a chocolate icing – to do this, heat the cream, add the chocolate pieces and melt them while stirring.