One of my favorite sandwiches--I keep a round loaf of sliced sourdough in the freezer at all times, just for this sandwich. A good ciabatta would be equally good, I think. You could easily sub your favorite cheese for the provolone, try swiss. Feel free to adjust ingredient amounts to suit your taste. Lovely with a cup of soup or side salad, for a satisfying quick and easy lunch or weeknight meal. Enjoy!