INGREDIENTS
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1 ½ cups unsalted butter, room temperature
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1 ½ cups superfine sugar
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3 teaspoons instant espresso dissolved in ½ cup boiling water
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6 eggs
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2 tablespoons kahlua
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2 tablespoons whole milk
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3 cups all-purpose flour
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2 tablespoons baking powder
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1/3 cup cocoa powder
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1 teaspoon kosher salt
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For the Frosting:
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12 ounces semisweet chocolate
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12 ounces bittersweet chocolate
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5 large egg whites
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1 ½ cups superfine sugar
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1 pinch cream of tartar
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2 teaspoons kosher salt
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1 pound unsalted butter, room temperature
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2 teaspoons hazelnut extract
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1 cup lightly toasted hazelnuts, coarsely chopped