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In a bowl, beat the egg yolks and cornflour with an electric beater. Add the sugar and beat until pale and thick.
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Meanwhile, combine the milk and vanilla paste/vanilla bean seeds in a saucepan over medium until, until just simmering.
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Gradually pour the hot milk mixture onto the egg yolks, whisking continuously until fully combined.
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Return the egg yolk and milk mixture to the sauce pan and stir continuously over a low heat until the mixture thickens and coats the back of a spoon, about 5 minutes. (remember that the custard will thicken further as it cools).
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Cool until ready to serve.