INGREDIENTS
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13 tablespoons butter (no substitutes)
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6 1/2 ounces unsweetened chocolate, coarsely chopped
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1 1/2 cups sifted cake flour or all-purpose flour
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3/4 teaspoon baking powder
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1/2 teaspoon salt
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4 eggs
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2 cups sugar
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1 1/4 teaspoons vanilla
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1 1/4 cups coarsely chopped walnuts, toasted