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In a large casserole pot, heat oil over medium-high heat. Add onion and garlic and saute until soft and translucent, about 2 minutes. Add celery and carrot and season with salt and pepper. Saute until all the vegetables are soft, about 5 minutes. Add tomatoes, basil, and bay leaves and reduce the heat to low. Cover the pot and simmer for 1 hour or until thick. Remove bay leaves and taste seasoning. If sauce tastes too acidic, add unsalted butter, 1 tablespoon at a time, to round out the flavor. Pour half the tomato sauce into the bowl of a food processor until smooth, then repeat with second half as the sauce.
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