• Preheat oven to 350ºF. Lightly spray a 13" x 9" baking dish with cooking spray. Line with a piece of parchment paper that hangs over the long sides of the pan. Set aside.
• In a stand mixer with the paddle attachment add the Devil's food cake mix, sour cream, port wine, vegetable oil, and eggs and beat well to combine.
• Pour the cake batter into the prepared pan and bake for 40 minutes, or until a cake tester or toothpick inserted in the center comes out clean. Remove and cool completely.

Dark Chocolate Fudge Frosting

• Melt the chocolate and allow to cool.
• Beat the room temperature butter, powdered sugar, and cocoa powder until creamy, about 2 minutes. Add the cooled chocolate, heavy cream, and espresso or strong coffee and beat until smooth.

Assemble the Cake

• Either remove the cake from the pan and place on a cake plate, or dollop fudge frosting directly on the cooled cake in the pan. Spread with an offset spatula or spoon. Sprinkle with Maldon or flaky salt, cut and serve immediately.