In the top of a double boiler combine the cornstarch and sugar. Slowly begin to whisk in the milk, making sure to scrape the bottom and sides with a heatproof spatula incorporating the dry ingredients. Place over gently simmering water and stir occasionally, scraping the bottom and sides. If lumps begin to form use a whisk to beat smooth as necessary. When the mixture begins to thicken (about 15-20 minutes) and coats the back of the spoon, add the chopped chocolate. Continue to stir for about 3-4 minutes, or until the pudding is smooth and thickened. Remove from heat and stir in the vanilla. Strain through a fine-mesh strainer and pour into serving bowl.
Place plastic wrap on top of the pudding and smooth it gently against the surface. Refrigerate for at least 30 minutes, or up to 3 days.
Notes
Recipe adapted via John Scharffenberger
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