Combine chocolate, butter, and vanilla in a medium bowl, and
set aside. Heat milk in a medium saucepan, and bring to a
simmer. Whisk sugar, cocoa, cornstarch, and salt together in a
bowl. Beat the yolks in a bowl, using an electric mixer set on
medium, for 1 minute. Reduce the mixer speed to low, and add
the sugar mixture. Beat together until it resembles wet sand.
Add half the hot milk, and whisk until blended. Transfer the
cocoa mixture to the saucepan. Cook over medium heat, while
continuously whisking, until thickened -- about 8 minutes. Strain
into the bowl of chocolate. Let sit for 3 minutes before stirring
smooth with a wooden spoon. Press a sheet of plastic wrap
onto the surface of the pudding and chill for 2 hours before
serving.
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