In a large pot heat oil over medium heat. Add onion & garlic and sauté until soft and translucent, about two minutes. Add celery & carrots, season with salt & pepper. Sauté until all the vegetables are soft, about 5 min. Add crushed tomatoes, basil, & bay leaves. Simmer, covered, on low heat for 1 hr. until sauce is thick. Remove bay leaves and check for seasoning. If sauce tastes acidic, add unsalted butter, 1 T. at a time to round out flavors. Add ˝ sauce into blender & blend until smooth. Continue with remaining sauce. Tip- May freeze up to 6 months.
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