Preheat oven to 425 degrees. In roasting pan, toss tomatoes with leeks, carrots, garlic, and oil. Season with salt and pepper. Roast in a single layer (tomato cut sides down) until tender, 1 hour. Using tongs, peel off tomato skins.
In saucepan, bring vegetables, vegetable broth, and 1 cup water to a boil. Reduce heat; simmer 10 minutes.
In batches, puree in blender. Stir in basil.
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