1. Make the Cream Base
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Dissolve cornstarch in 200 ml cold milk, whisking until smooth.
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In a saucepan, combine remaining 800 ml milk with condensed milk and vanilla sugar.
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Heat over medium, stirring constantly until warm.
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Gradually add cornstarch mixture, whisking continuously.
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Cook over low heat for 5–8 minutes until thick and pudding-like. Remove from heat.