The noted French chef JacquesPepin also makes a version using chicken instead of ham, which he demonstrated in the "Our Favorite Sandwiches" episode on the PBS series (and its coordinating cookbook of the same title) Julia and Jacques Cooking at Home in which he worked with Julia Child
Professional cooks everywhere, including Julia Child, JacquesPepin, and Martha Stewart, exclaim the wonderful benefits of cooking with copper -- heats more evenly and faster than other metals with superior control
Meanwhile, spread out the bread cubes on a baking sheet and toast for about 8 minutes, or until lightly golden. 1/2 pound sourdough baguette, cut into 1/2-inch cubes