1 Rinse tomatoes, then cut into halves. Place them, cut sides up, on a baking pan.
2 Cut butter into small dots and distribute evenly over the tomatoes. Season with salt and pepper, dividing salt among the 4 tomato halves.
3 Sprinkle on remaining ingredients in the order listed, distributing them evenly among the 4 halves.
4- Place under a preheated broiler for about 15 minutes, or until cheese melts and tomatoes are thoroughly heated.