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Place milk and vanilla in a saucepan and heat to boiling point.
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In a separate bowl, combine sugar, egg yolks and cornstarch until smooth.
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Pour about 1/3 of the amount of hot milk on the egg yolk mixture while whisking to compare temperatures.
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Return the resulting mixture to the pot with the rest of the milk and whisk well.
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Return to cooking over a medium-low flame, whisking constantly, until a uniform, thick and very stable pastry cream is obtained. It takes a few minutes of vigorous whipping and the cream should thicken greatly at this point and there should be boiling bubbles.
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Transfer the prepared cream to a bowl, cover the surface of the cream with cling foil and refrigerate until completely cold.
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Transfer the cold cream to a bowl and whisk it well until it returns to its original texture.
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In a separate bowl, whip the cream into a very stable whipped cream.
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Fold the whipped cream into the pastry cream until a uniform, fluffy and stable vanilla cream is obtained.