One Dish Tomato Pasta

Ingredients

• 12
• ounces linguine
• 12
• ounces cherry or grape tomatoes, halved or quartered if larg
• 1
• onion, thinly sliced (about 2 cups)
• 4
• cloves of garlic, thinly sliced
• 1/2
• teaspoon red pepper flakes
• 2
• sprigs basil, plus torn leaves for garnish
• 2
• tablespoons extra-virgin olive oil, plus more for serving
• Coarse salt
• Freshly ground black pepper
• 4 1/2
• cups water
• Freshly grated Parmesan cheese, for serving