Stuffed Creamy Tomato Basil Pasta Shells

Bahan-bahan (6 porsi)

• 6 regular or heirloom tomatoes, quartered
• 1 yellow onion, quartered
• 6 cloves garlic, smashed
• 2 tablespoons fresh thyme leaves
• 6 tablespoons salted butter
• salt, black pepper, and chili flakes
• 1/2 cup heavy cream
• 1 pound jumbo shells
• 1 cup whole milk ricotta cheese
• 2 cups shredded provolone cheese
• 3/4 cup basil pesto
• 1 cup shredded or torn mozzarella
• basil, for serving