INGREDIENTS
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Vegetable oil, for pan
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1 jar (7.4 ounces) peeled roasted chestnuts
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1 cup whole milk
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1/4 cup plus 1 tablespoon light-brown sugar
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Pinch of coarse salt
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3 large egg yolks
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1 tablespoon cornstarch
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1 teaspoon pure vanilla extract
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1 tablespoon unsalted butter, room temperature
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2 ounces bittersweet chocolate (preferably 61 percent cacao), melted and slightly cooled, plus more for shavings
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1 1/2 cups cold heavy cream
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24 chocolate wafer cookies (from 1 package)