4 boneless pork chops
2 large, very firm, tomatoes, diced small
½ large red onion, finely diced
3-4 cloves garlic, finely minced
2 tbsp olive oil, plus more for basting
1½ tbsp good balsamic vinegar, plus more for drizzle
½ tsp salt
fresh basil leaves, cut into thin strips
1 cup shredded mozzarella cheese (or thinly sliced, whatever you prefer)
salt to taste
pepper to taste