INGREDIENTS
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3 cups lightly packed dark brown sugar
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1 cup (2 sticks) unsalted butter, at room temperature
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8 extra-large eggs
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1 tablespoon pure vanilla extract
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1/8 teaspoon fine sea salt
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1 1/2 cups all-purpose flour
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2/3 cup Dutch-processed cocoa powder
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2 tablespoons instant espresso powder
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2 cups toasted nuts, such as a mixture of pecans, walnuts, and hazelnuts, chopped
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2 cups semisweet chocolate chips
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For the frosting:
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1 1/4 cups superfine sugar
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2 tablespoons instant espresso powder
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1/4 cup Cognac
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1/4 cup whole milk
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6 tablespoons unsalted butter
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1 cup semisweet chocolate chips