"Adapted from Brooklyn Blackout Cake recipe from The Cake Book by Tish BoyleThis is about 1/3 of the original recipe...."
INGREDIENTS
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1/2 cup all purpose flour
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1/3 cup natural cocoa powder
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1/2 teaspoon baking powder
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1/2 teaspoon baking soda
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1/3 teaspoon kosher salt
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2/3 cups sugar
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1 large egg
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1/2 large egg yolk
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1/3 cup buttermilk
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1.3 oz unsalted butter, melted
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1 teaspoon vanilla extract
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1/3 cup hot coffee
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1 large egg yolks
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1 1/2 oz sugar
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2 tsp cornstarch
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1 pinch kosher salt
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1/3 cup water
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3 Tbsp + 2 tsp heavy cream
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1 ounces semisweet chocolate, finely chopped (I used chips)
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1/3 teaspoon vanilla extract
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1.3 oz unsweetened chocolate, coarsely chopped
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1.84 oz unsalted butter, softened
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2.5 oz powdered sugar
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milk, as needed, to thin the frosting (optional)