Make the custard- Bring the milk to a simmer in a medium saucepan over medium heat. Whisk the egg yolks, cornstarch, sugar and salt in a large bowl. Gradually pour the hot milk into the egg mixture, whisking constantly. Pour the mixture back into the saucepan and cook, whisking constantly, until thick and bubbling, about 3 minutes. Strain through a fine-mesh sieve into a bowl, pressing the custard through with a rubber spatula. Stir in the butter and vanilla until smooth.
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