INGREDIENTS
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4 ounces unsweetened chocolate, chopped
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1 cup firmly packed light brown sugar
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1/4 cup lightly packed premium unsweetened Dutch-processed cocoa
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2 cups granulated sugar
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3/4 cup boiling water
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1/2 cup canola oil
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3/4 cup full-fat sour cream
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3 egg yolks at room temperature
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2 cups all-purpose flour
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3 eggs at room temperature
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3/4 teaspoon baking soda
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6 egg whites
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1 1/8 teaspoon fine sea salt
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1/4 teaspoon cream of tartar
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2 1/2 cups unsalted butter at room temperature
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4 cups raspberries, fresh or frozen