INGREDIENTS
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½ cup hot water
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3 ounces unsweetened chocolate, chopped
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1 tablespoon instant coffee powder
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½ cup unsalted butter, softened
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2 cups sugar
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2 large eggs
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1 teaspoon vanilla extract
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2 cups sifted cake flour, such as Swans Down
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1 teaspoon baking soda
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1 cup sour cream
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8 ounces semisweet chocolate, chopped
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½ cup heavy whipping cream