Smoked mozzarella serves as the perfect counterpoint to the juiciness of roasted tomatoes here. Warming these sandwiches in the oven so that the cheese has barely melted makes this combination totally unforgettable. Good country bread is a must.
Smoked mozzarella is becoming more widely available, but if you can't find it, fresh mozzarella can be substituted. It won't be the same sandwich, but it will still be very good.