"This four-layer Southern classic is made with cocoa powder, not chocolate, with a generous spoonful of mayonnaise in the batter to keep the cake moist and rich. A simple, luscious ganache of semisweet chcoolate, cream, and butter does double duty as filling and frosting...."
INGREDIENTS
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1 lb. semisweet chocolate (preferably 58% cacao), finely chopped
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2 cups heavy cream
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1 oz. (2 Tbs.) unsalted butter, softened
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6 oz. (3/4 cup) unsalted butter, softened; more for the pans
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8 oz. (1-3/4 cups) all-purpose flour; more for the pans
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2 cups packed dark brown sugar
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2 tsp. pure vanilla extract
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3 large eggs, at room temperature
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2-1/4 oz. (3/4 cup) unsweetened Dutch-processed cocoa powder
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1-1/4 tsp. baking soda
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1 tsp. baking powder
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1 tsp. kosher salt
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1-1/2 cups buttermilk, preferably low fat, at room temperature
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1/4 cup mayonnaise