INGREDIENTS
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***Cake:***
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1 cup sugar, divided
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1/2 cup all-purpose flour
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1/4 cup unsweetened cocoa powder
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5 eggs, room temperature, separated
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1 teaspoon vanilla extract
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1/2 teaspoon baking powder
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1/4 teaspoon baking soda
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1/4 teaspoon salt
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1/4 teaspoon cream of tartar
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***Filling:***
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1 cup heavy whipping cream
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1/2 cup powdered sugar + 1/4 cup for dusting tea towel
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1 teaspoon instant coffee granules
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1/2 teaspoon vanilla extract
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***Frosting:***
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2 cups powdered sugar
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1/3 cup unsweetened cocoa powder
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1/3 cup butter, room temperature
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2 tablespoons milk
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1 tablespoon strongly brewed coffee
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1/2 teaspoon vanilla extract