"Start this a day ahead and freeze overnight. For the crust, blend crumbled vanilla wafer cookies in a processor until crumbs form...."
INGREDIENTS
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1/3 cup chopped pecans
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2 tablespoons sugar
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2/3 cup vanilla wafer cookie crumbs (from about 32 cookies)
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1/2 teaspoon ground cinnamon
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2 tablespoons (1/4 stick) unsalted butter, melted
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2 tablespoons boiling water
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1 tablespoon instant espresso powder or instant coffee powder
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1 cup sugar
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2 tablespoons unsweetened cocoa powder
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1 cup whipping cream
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1/4 cup light corn syrup
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2 ounces unsweetened chocolate, finely chopped
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2 tablespoons (1/4 stick) unsalted butter
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1 1/2 teaspoons vanilla extract
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2 pints caramel ice cream (such as dulce de leche)
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1/2 cup chilled whipping cream
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1 tablespoon powdered sugar
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2 tablespoons chopped pecans