INGREDIENTS
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Cake:
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1 1/2 cups fine chocolate wafer crumbs (about 30 wafer cookies)
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1/2 stick (1/4 cup) unsalted butter, melted
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1 1/2 pints coffee ice cream, softened slightly
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1 1/2 cups well-chilled heavy cream
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1 teaspoon vanilla
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1/2 cup chocolate wafers, crumbled
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For the dark chocolate sauce:
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1 1/2 cups heavy cream
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2/3 cup firmly packed dark brown sugar
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4 ounces fine-quality bittersweet chocolate, chopped
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3 ounces unsweetened chocolate, chopped
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1/2 stick (1/4 cup) unsalted butter, softened