INGREDIENTS
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3 sticks plus 2 tablespoons unsalted butter
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12 ounces best-quality bittersweet chocolate
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6 eggs
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1 3/4 cups superfine sugar
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1 tablespoon pure vanilla extract
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1 1/2 cups plus 2 tablespoons all-purpose flour
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1 teaspoon salt
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1/2 cup white chocolate buttons, chips, or morsels
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1/2 cup semisweet chocolate buttons, chips or morsels
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Approximately 2 teaspoons confectioners' sugar, for garnish
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Special equipment: Baking tin (approximately 11 1/4 inches by 9 inches by 2 inches), sides and base lined with baking parchment.