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Preheat the oven to 350°F and line a large baking sheet with parchment paper.
Place the tomatoes cut side up on the baking sheet, drizzle with 2 tablespoons of the olive oil, and sprinkle with salt and pepper.
Roast for 1 hour, or until the edges just start to shrivel and the insides are still juicy.
Heat the remaining 2 tablespoons olive oil in a large pot over medium heat.
Add the onions, carrots, garlic, and ½ teaspoon salt and cook until soft, about 8 minutes.
Stir in the tomatoes, vegetable broth, vinegar, and thyme leaves and simmer for 20 minutes.
Let cool slightly and pour the soup into a blender, working in batches if necessary.
Blend until smooth. Add the basil and pulse until combined.
Season to taste, ladle into bowls, and garnish with fresh basil leaves.