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In page Tomato sauce:

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Tomato gravy is distinct from the term as used by Italian Americans when referring to a type of tomato sauce particularly where tomatoes were a staple food.[citation needed] The cooked tomatoes, some fat (usually cured pork fat) and flour are cooked together until thick, and seasoned with salt and pepper. Onions or bell peppers may be added as well. Typically, tomato gravy is served over pasta.