homemade devil dog, ding dong or hostess cake

INGREDIENTS

• 3 ounces fine-quality semisweet chocolate such as Callebaut
• 1 1/2 cups hot brewed coffee
• 3 cups sugar
• 2 1/2 cups all-purpose flour
• 1 1/2 cups unsweetened cocoa powder (not Dutch process)
• 2 teaspoons baking soda
• 3/4 teaspoon baking powder
• 1 1/4 teaspoons salt
• 3 large eggs
• 3/4 cup vegetable oil
• 1 1/2 cups well-shaken buttermilk
• 3/4 teaspoon vanilla
• 2 large egg whites
• 1/2 cup sugar
• 1/4 cup light corn syrup
• 2 tablespoons water
• 1 1/2 teaspoons pure vanilla extract
• 1/2 pound fine-quality semisweet chocolate such as Callebaut
• 1/2 cup heavy cream
• 1 tablespoon sugar
• 1 tablespoons light corn syrup
• 1/4 stick (2 tablespoons) unsalted butter