Chef Keller asks his chef friends to create their favorite sandwiches. Chef Vincent Poussel of the famed Auerole restaurant in Las Vegas makes an unforgettable ham and cheese with home-cured ham on kalamata olive bread. Two-star Michelin Chef Julian Serrano uses chorizo and saffron aioli to spice up an egg sandwich. Recipes: Home-Cured Ham and Cheese on Kalamata Olive Bread, Fried-Egg Sandwich with Chorizo, Padron Peppers and Saffron Aioli