This pleasant sandwich is something that I love to make on the weekends. It's sort of a variation on the basic croque-monsieur idea. I use quality sourdough (I get mine from the Central Market bakery), smoked ham, and mozzarella. Add to that a little fresh ground black pepper and dried rosemary and it sends me over the moon. I generously butter my sourdough slices, top slice with mozzarella, sprinkle with pepper and rosemary, layer several slices of ham, and top with the second slice of bread. Toast over medium-high heat on each side, let set just a moment once it's done so that you can slice it without the cheese sliding too much, and then just enjoy.