"This recipe is excerpted from "Martha Stewart's Cakes" (Clarkson Potter, September 2013; $25)...."
INGREDIENTS
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3 tablespoons unsalted butter, plus more for cake pan
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6 ounces bittersweet chocolate, preferably 70 percent cacao, chopped
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6 large eggs, separated, room temperature
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1 cup sugar, divided
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3 tablespoons instant-espresso powder
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1/4 teaspoon coarse salt
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1 tablespoon pure vanilla extract
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Chocolate Glaze