Preheat oven to 350°F. Grease two 8-inch round cake pans.
Mix as directed for pound cake and bake in prepared pans for 25 to 30 minutes.
Cool in pan for 10 minutes. Remove cake from pan. Cool completely on wire rack.
Combine chocolate, butter and powdered sugar; mix well. Gradually stir in hot water until a smooth consistency is achieved.
Place one cake on serving plate. Spread pudding evenly over surface of cake; top with remaining cake. Spoon warm icing over top, allowing some to drip down sides of cake. Serve immediately or refrigerate.