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TO MAKE THE CRUST: In 1 or 2 batches, whirl the cookies in the work bowl of a food processor fitted with the metal blade until ground into coarse crumbs.
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Add the melted butter and pulse until the butter is thoroughly combined.
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3
Press the mixture into twelve 4 3/8-inch-diameter (1-cup) foil tartlet pans, making sure the crumbs cover the pans sides.
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Refrigerate until ready to fill.
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5
TO MAKE THE FILLING: Heat the milk and 1 cup cream with the split vanilla beans in a large, heavy-bottomed saucepan over medium heat until hot but not boiling.
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Remove from the heat.
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In a large bowl, vigorously and thoroughly whisk together the egg yolks, the granulated sugar, and the flour, about 30 seconds.
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8
Remove the vanilla beans from the milk mixture and discard.
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Slowly pour about 1/4 cup of the milk mixture into the egg mixture, whisking constantly.
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Set the saucepan with the remainder of the milk mixture over medium-low heat.
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(This tempers the eggs, ensuring that they do not curdle.)
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Whisking constantly, slowly pour in the egg mixture.
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Continue whisking until the mixture thickens into a pudding-like consistency, 4 to 5 minutes.
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The mixture should be thick enough that the whisk leaves visible tracks as it passes through.
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Whisk in the chocolate, the 1/4 cup butter, and the salt, and stir until melted.
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Pour the chocolate filling into the individual pie pans to just below the top of the cookie crust.
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Immediately cover with plastic wrap, making sure it touches the filling at all points to prevent a skin from forming.
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Refrigerate for at least 4 hours (overnight is better to make sure the chocolate sets up).
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TO MAKE THE COCOA CREAM: Using an electric mixer fitted with the whisk attachment, whip the 4 cups cream in a large bowl on high speed until firm peaks form.
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Add the powdered sugar and cocoa and whip until thoroughly combined.
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Cover each pie with a generous mound of whipped cream.
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TO SERVE THE PIES: Gently push the bottom of the each foil pan to slip the pie onto individual dessert or serving plates.
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Garnish each pie with chocolate shavings: draw a vegetable peeler along the edge of an 8-ounce chocolate bar, letting the shavings fall onto waxed paper.
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24
Alternatively, use a gourmet hot chocolate mix, many of which are made with chocolate shavings, such as Williams-Sonoma Hot Chocolate.
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For single servings, use standard nonstick muffin tins.
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To release the pies, run a sharp paring knife around the edges and theyll pop out.
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27
You can refrigerate the crust-lined tart pans up to 4 days ahead.
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The filled pies can chill up to 3 days in advance.
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You can add the cocoa cream the day they are ready to serve.