"The popular brownie recipe from Zingerman's food stores...."
INGREDIENTS
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13 tablespoons unsalted butter
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6½ ounces unsweetened chocolate, coarsely chopped
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¾ cup sifted all-purpose flour
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¾ cup sifted cake flour
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¾ teaspoon baking powder
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½ teaspoon salt
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2 cups granulated sugar
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4 eggs
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1¼ teaspoons vanilla extract