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16 tablespoons unsalted butter
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1/2 cup unsweetened cocoa powder
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2 teaspoons vanilla extract
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2/3 cup all-purpose flour, sifted
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13 ounces semisweet chocolate, chopped into small pieces
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1/2 cup toasted hazelnuts
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6 1/2 ounces semisweet (dark) chocolate, cut into small pieces
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