INGREDIENTS
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12 ounces bittersweet chocolate, finely chopped
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12 large eggs, separated and at room temperature
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2 cups sugar
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2 teaspoons pure vanilla extract
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1 tablespoon dark rum
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3 1/2 sticks unsalted butter, softened and cut into tablespoons
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1/4 cup all-purpose flour
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1/2 cup unsweetened Dutch-processed cocoa powder, such as Valrhona
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1/2 teaspoon salt
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Powdered sugar, for dusting