Use a little more cornflour if you like your custard thick. Put the egg yolks in a medium saucepan with the cornflour and sugar. Scrape the vanilla seeds into the pan, or add the vanilla extract ...
Mix together the 150g of icing sugar, 70g unsalted butter, 1 heaped tbsp instant custard powder and 1 tsp vanilla extract (for the filling) until the texture is smooth, before putting a second ...