Enjoy this moist, rich dark chocolate cake for a special celebration. Made with a combination of dark chocolate and bittersweet cocoa powder, the batter is sprinkled with granulated and brown sugar for sweetness. Then, cocoa is sifted on its surface and coffee is poured on top. After baking for an hour, the cake is covered with foil and returned to the oven until it's cooked through. It's an unusual technique with decadent results.