1/3 cup balsamic vinegar 1 (8-ounce) sliced fresh mozzarella cheese log 12 fresh basil leaves 6 grape or cherry tomatoes 3 large black olives 1 tablespoon extra virgin olive oil, or to taste (optional) sea salt and freshly ground black pepper to taste (optional) Pour balsamic vinegar into a small saucepan. Cook, stirring occasionally, over medium heat until vinegar has reduced to about 2 tablespoons and is thick…