To make the custard, put the whole milk in a large pan over a medium heat and bring to a simmer. Meanwhile, put the egg yolks, caster sugar, cornflour, and vanilla extract into a large bowl and whisk until smooth. Pour the hot milk over the egg mixture, whisking together. Pour the custard back into the pan and cook gently, whisking constantly, until thickened then pour into a bowl, cover with clingfilm and chill until cool.
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