Fresh Tomato and Basil Pasta

INGREDIENTS

• Sea salt, to taste, plus 1/2 tsp.
• 1/4 cup extra-virgin olive oil
• 2 Tbs. balsamic vinegar
• 1 garlic clove, pressed or minced
• Freshly ground black pepper, to taste
• 3 lb. ripe heirloom tomatoes, cored
• 12 oz. whole wheat penne
• 8 oz. mozzarella bocconcini, halved
• 1 cup packed fresh basil leaves, torn into pieces
• 1/4 cup grated Parmigiano-Reggiano cheese
• Red pepper flakes for serving (optional)