Vanilla slice

Instructions

1. Roll out the puff pastry and prick it with a fork. Bake in a preheated oven at 200 °C for 15 to 20 minutes, until golden and well dried out.
2. Let it cool completely, then cut the baked pastry into two equal sheets to make the layers.
3. Heat the milk with the split and scraped vanilla pod until it just starts to simmer, then take off the heat.
4. In a bowl, whisk the yolks with the sugar and cornflour, then gradually pour in the hot milk while whisking.
5. Pour everything back into the pan and stir constantly over medium heat until thickened, about 3 minutes. Off the heat, stir in the butter and salt.
6. Spread the hot custard over one pastry sheet, leave it to cool for 10 minutes, then top with the second sheet. Chill for 2 hours.
7. Make the icing by mixing the icing sugar with hot water until thick, spread it over the top, then dust with cocoa and cut into slices.