Pesto Chicken

Bahan-bahan (4 porsi)

• 4 small boneless skinless chicken breasts (about 5 ounces each)
• ⅓ cup pesto (divided)
• 1 tablespoon balsamic vinegar
• 1 tablespoon olive oil
• 4 slices fresh mozzarella cheese
• chopped fresh parsley (or fresh basil for serving, optional)
• 1 large Roma tomato
• 2 teaspoons olive oil
• 1 teaspoon red wine vinegar
• 1 clove garlic (minced)
• ¼ teaspoon dried basil
• salt and black pepper (to taste)