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Tomato sauce is any of a very large number of sauces made primarily from tomatoes, usually to be served as part of a dish (rather than as a condiment). Tomato sauces are common for meat and vegetables, but they are perhaps best known as sauces for pasta dishes.
Tomatoes have a rich flavour, high liquid content, very soft flesh which breaks down easily, and the right composition to thicken into a sauce when they are cooked (without the need of thickeners like roux). All of these qualities make them ideal for simple and appealing sauces. The simplest tomato sauces consist just of chopped tomato flesh cooked in a little olive oil and simmered until it loses its raw flavour, and seasoned with salt.
Optionally tomato skins may be scalded and peeled according to texture (especially thicker "pelati" paste varieties) and tomato seeds may be removed for bitterness.
Water (or another, more flavourful liquid such as stock or wine) is sometimes added to keep it from drying out too much. Onion and garlic are almost always sweated or sautéed at the beginning before the tomato is added. Other seasonings typically include basil, oregano, parsley, and possibly some spicy red pepper or black pepper. Ground or chopped meat is also common. In countries such as Australia, New Zealand, South Africa and the United Kingdom, the term "tomato sauce" is used to describe a condiment similar to that known in the United States as 'ketchup'. In some of these countries, both terms are used for the condiment.
Sauce tomate is one of the five mother sauces of classical French cooking, as codified by Auguste Escoffier. It consists of salt belly of pork, onions, bay leaves, thyme, tomato purée or fresh tomatoes, roux, garlic, salt, sugar, and pepper. Many times, butter and flour will be listed in the ingredients, but those are only used to make the roux (thickening agent). Roux is made of equal parts by weight of flour and butter cooked. Any extra flour or butter that is called for in the recipe is typically an error.
New Zealand, Australia and South Africa 
The most common use of the term tomato sauce in New Zealand, Australia and South Africa is to describe a commercially produced condiment similar to American ketchup. Tomato based sauces served with pasta would commonly be referred to as pasta sauce.
The misconception that the tomato has been central to Italian cuisine since its introduction from the Americas is often repeated. Though the tomato was introduced from the Spanish New World to European botanists in the 16th century, tomato sauce made a relatively late entry in Italian cuisine: in Antonio Latini's cookbook Lo scalco alla moderna (Naples, 1692). Latini, not unsurprisingly, was chef to the Spanish viceroy of Naples, and one of his tomato recipes is for sauce alla spagnuola, "in the Spanish style." The use of tomato sauce with pasta appears for the first time in the Italian cookbook L'Apicio moderno, by Roman chef Francesco Leonardi, edited in 1790.
Tomato sauce was an ancient condiment in Aztec food. The first western person to write of what may have been a tomato sauce was Bernardino de Sahagún, who made note of a prepared sauce that was offered for sale in the markets of Tenochtitlan (Mexico City today). Then, Spaniards brought the use of tomato to Europe.
United States 
In most of the U.S., "tomato sauce" refers to a tomato concentrate with salt, herbs and small amounts of spices and often flavored with meat or seafood. This product is considered incomplete and not normally used as it is. Instead, it is used as a base for almost any food which needs a lot of tomato flavor, including versions of many of the sauces described on this page. Tomato purée and tomato paste have FDA standards of identity (since 1939) for percentage of tomato solids, and generally do not contain seasonings other than salt; tomato sauce is nonstandardized.
Marinara sauce is an Italian-American term for a simple tomato sauce with herbs—mostly parsley and basil—but, contrary to what the name might suggest ('marinara' is Italian for "sailor-style") without anchovies, fish, or seafood. In Italy, marinara refers either to sauces made with tomato and garlic (as in pizza marinara) or to seafood-based sauces or foods; in this case, the name does not imply that tomato is either included or excluded.
Some Italian Americans on the East Coast and around the Chicago area refer to tomato sauce as "gravy", "tomato gravy", or "Sunday gravy", especially sauces with a large quantity of meat simmered in them, similar to the Italian Neapolitan ragù. "Gravy" is an erroneous English translation from the Italian sugo which means juice, but can also mean sauce (as in sugo per pastasciutta). The expression for "gravy" in Italian is sugo d'arrosto, which is literally "juice of a roast" and is not specifically tomato sauce. Sicilian Americans in communities like Buffalo and Rochester, New York use the terms "sarsa" and "succu" interchangeably for tomato sauces of all types used with pasta, and "gravy" only in reference to brown meat gravies.
American supermarkets commonly carry a variety of prepared tomato sauces described as "spaghetti sauce" or "pasta sauce." Common variations include meat sauce, marinara sauce, and sauces with mushrooms or sweet red peppers.
A spicy tomato sauce known as sauce piquante is common in Louisiana Cajun cuisine, that can contain any seafood, poultry, or meats such as wild game. It is typically served over white rice. In Louisiana Creole cuisine, there is a tomato sauce known as a Creole sauce. It is similar to Italian tomato sauce, but features more Louisiana flavors derived from the fusion of French and Spanish cooking styles. They both usually contain the traditional holy trinity of diced bell pepper, onion, and celery.
Tomato gravy 
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. 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. It is also eaten largely by Creole people in the Southern United States, who eat it over rice.
Indian curry, especially as it has been exported out of India, is recognizable for heavily spiced sauces, often made from a tomato base.
See also 
- "traditional aussie meat pie with ketchup (or tomato sauce, as they would say) - perth - Australia - Leah Down Under - WorldNomads Adventures". Journals.worldnomads.com. Retrieved 2010-11-17.
- L'Arte della cucina in Italia, Emilio Faccioli, Einaudi, Milano, 1987
- Auguste Escoffier, The Complete Guide to the Art of Modern Cookery (New York: Wiley, 1979), 9–10.
- "Tucker". Australianbeers.com. Retrieved 2010-11-17.
- Elizabeth David, Italian Food (1954, 1999), p 319, and John Dickie, Delizia! The Epic History of the Italians and Their Food, 2008, p. 162.
- "Contadina – Tips & Advice – Contadina FAQs". Contadina.com. Retrieved 2010-11-17.
- Love, C., Webster's New World Italian Dictionary, Concise Edition (Macmillan 1991) ISBN 0-13-953639-6
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- The Cook's Decameron: A Study In Taste, Containing Over Two Hundred Recipes For Italian Dishes from Project Gutenberg. This is from a very old source, and reflects the cooking at the turn of the 20th century.
- Free Culinary School Podcast Episode 11 A podcast episode that discusses how to make the classical French Mother Sauce version of "Sauce Tomat," which modern versions of tomato sauce are derived from.
- Classic, authentic Italian "Sunday Gravy"