INGREDIENTS
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1/4 pound wheatmeal crackers finely crushed (about 1 cup)
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1 ounce fine-quality bittersweet chocolate (no more than 60% cacao if marked), grated
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1/2 stick unsalted butter, melted
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1/2 pound fine-quality bittersweet chocolate (no more than 60% cacao if marked), chopped
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1 stick unsalted butter, cut into pieces
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1 pound 2 ounce cream cheese, at room temperature
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1/2 cup sour cream
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1/4 teaspoon pure vanilla extract
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2 large eggs
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2/3 cup superfine granulated sugar
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1 cup hazelnuts (4 1/2 ounces), toasted loose skins rubbed off in a kitchen towel while still warm, and nuts chopped
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Accompaniment: lightly sweetened whipped cream