In a medium-sized bowl, combine the tomatoes, onions, basil, garlic, olive oil, and balsamic vinegar. Season with sea salt and freshly ground black pepper to taste.
2 cups of Italian tomatoes cut into fine cubes, 1 onion, ⅓ cup fresh basil leaves, 2 tsp. garlic, 3 tbsp. extra-virgin olive oil, 1 tbsp. balsamic vinegar, Sea salt and freshly ground black pepper to taste