Brits call tomato sauce "red sauce".
Tomato sauce is often also used interchangeably with "ketchup," "tomato sauce" can also refer to the type of sauce that is used for pizza, pasta and other dishes which can lead to confusion.
Ketchup is the term that is most commonly used for the sweet, tangy tomato based condiment that is similar to what Americans call ketchup.
Tomato sauce is made primarily with tomatoes and various herbs, spices and other vegetables.
Broken tomato sauce is tomato sauce, which has separated, which results in a greasy or oily appearance on top of the tomato sauce as well as a watery layer underneath the tomato sauce.
The separation of the tomato sauce indicates that the emulsion of the tomato sauce has broken down and means that the fat and the liquid components have separated instead of remaining combined like they normally should be.
Tomato sauce relies on an emulsion, which is a stable mixture of liquid and fat.
And when the emulsion breaks, the fat and liquid then separates and causes the tomato sauce to look greasy or watery.
Broken tomato sauces can occur as a result of improper mixing, temperature changes or from using too much liquid or fat.
Broken tomato sauce can often be fixed by gently reheating the tomato sauce, while you whisk it or by adding in a small amount of some base liquid such as water or more sauce and whisk vigorously.
In tomato sauce though it is not always an emulsion, but the separation of the tomato sauce can also occur when you use oil or butter which can also separate out.
Adding too much oil or butter to the tomato sauce can result in broken tomato sauce also known as separation.