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Heat the milk, 2 tablespoons of caster sugar and the vanilla in a small pot.
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In a small bowl, beat the remaining 2 tablespoons of caster sugar, the flour, corn flour and egg yolks together until pale and thick (3 minutes with electric beaters).
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Once the milk has just reached a simmer, slowly pour half the milk into the egg yolk mixture, beating continuously to combine. Return the remaining milk to the heat, and while whisking continuously, pour the egg yolk mixture into the milk.
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Whisk constantly over a medium heat until it thickens. It will thicken quite suddenly as it reaches boiling point (about 2-3 minutes usually).
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Once it thickens, pour into a bowl. Cut a circle of baking paper to put directly on top of the custard to prevent a ‘skin’ forming on the surface. Refrigerate until needed.
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When ready to use, whisk briefly with a fork until it is smooth & creamy.