Hazırlanışı
1To make the buns, heat the milk, butter and 150ml water very gently in a medium-sized saucepan until all the butter has melted. Get the flour and some salt ready, then increase the heat and bring the liquid to the boil. As soon as it is boiling, remove from the heat and beat in the flour and a pinch of salt with a wooden spoon. Keep beating until the mixture is smooth and comes away from the sides of the pan. Cool for 5 mins.
2Gradually add the eggs, mixing well between each addition until the mixture reluctantly drops off the spoon. Don’t add all the egg unless you need to. Spoon into a piping bag with a 1.5-2cm star or round nozzle and set aside until ready to bake.
3To make the filling, bring the milk just to the boil in a saucepan with the vanilla paste or split pod. Meanwhile, whisk together the egg yolks, sugar and flours in a mixing bowl. Pour on the hot milk while continuously whisking the egg mixture. Discard the pod (if using) and return the mix to a wiped-out saucepan. Cook over a gentle heat, stirring, until the mix is thicker than a custard – it will get lumpy, but just carry on stirring and beat out the lumps. Transfer to another mixing bowl and lay cling film directly on the surface. Leave to cool, then chill.