Poke the puff pastry with fork and bake sheet on 200C for 10min on the back side of a baking tray.
2
Mix gelatin with 100ml water and leave to rest.
3
Using a mixer, beat the yolks and sugar till pale white.
4
Pour the milk in a saucepan and bring to a boil. Combine the yolks and milk and put back to the stove till boils again. Set aside.
5
Add gelatin and water and mix well to combine. Cool quickly. Ideally cool for 4-5 hours in the fridge mixing each 20-30min.
6
Beat the double cream, and add to the custard mixture using a whisk. Combine well and cool for a bit more.
7
Layer the cake. Place the first sheet to the bottom, then the cream in the middle. Cut the top of sheet into serving portions and arrange on the top. Leave in the fridge to cool for another few hours ideally. Serve with icing sugar.