Spaghetti Squash and Meatballs

INGREDIENTS

• 1 pound ground pork
• 2 large sprigs basil
• Kosher salt
• 2 stalks celery, chopped
• 2 large eggs
• 1 cup Italian-style breadcrumbs
• 1 pound ground beef
• 1 cup plus 3 tablespoons grated parmesan cheese
• 1 cup fresh parsley leaves
• 1 teaspoon dried oregano
• 1 medium spaghetti squash (about 2 pounds)
• 1 medium onion, roughly chopped
• 6 cloves garlic
• 3 tablespoons extra-virgin olive oil, plus more for brushing
• 2 28-ounce cans tomato puree
• 1 medium carrot, roughly chopped