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Start by making the pastry cream. Bring the milk to the boil with the orange zest and vanilla pod and seeds. In a separate bowl, mix together the egg and egg yolk, flour, sugar and cornflour until it creates a paste. Pour the hot milk onto the paste and whisk thoroughly, then return to the pan and continue to whisk until it comes back to the boil. Simmer for a few minutes, still constantly whisking, to cook out the flour. Pass through a fine sieve into a container and press cling film onto the surface before chilling