Make the choux pastry by mixing water, butter, flour, and eggs until a thick paste forms. Spread the pastry on a baking sheet into an even thin layer.
In a saucepan, add milk and vanilla beans. Simmer and then remove the vanilla pods.
In a separate bowl, mix egg yolks, sugar, cornstarch, and salt. Pour the mixture into the hot milk and whisk until bubbles form. Mix in butter.
Assemble the cake by placing the custard in the middle of the choux pastry and pouring chocolate ganache on top.
Let the cake sit overnight and then slice and serve.
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