INGREDIENTS
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1-1/2 sticks (12 tablespoons) unsalted butter, plus more for greasing the pan
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6 ounces semisweet chocolate, chopped (best quality -- I use Ghirardelli)
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1 cup granulated sugar
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5 large eggs
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3/4 cup cocoa powder
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4 large egg whites
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1/8 teaspoon cream of tartar
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3/4 cup sugar