INGREDIENTS
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12 oz fine-quality bittersweet chocolate (not unsweetened), chopped
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1 1/2 sticks (3/4 cup) unsalted butter, cut into tablespoon pieces
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1 1/2 teaspoons vanilla
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1/4 teaspoon salt
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3/4 cup sugar
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5 large eggs, separated and at room temperature for 30 minutes
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1/4 cup all-purpose flour
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Accompaniment: ice cream or lightly sweetened whipped cream