Banana Cake with Nutella Frosting, Fudge Sauce and Malted Chocolate Crumbs - or more from Milk Bar

 "You want me to make a choice?" manservant exhaled, with the fork still in his hand. It wasn't like I was making him choose between Penelope Cruz or Angelina Jolie, for God's sake. No, I just wanted to know which birthday cake he preferred. Our standard, triple layer, chocolate fudge cake or the new one set before him made from components of the Milk Bar cookbook. Was it the banana