The British sometimes call ketchup "tomato sauce", although the British also call Ketchup the same as Americans which is "ketchup:.
Ketchup is the common term for Ketchup in British, just like it is in America.
Although tomato sauce is also another term that is frequently used to refer to the condiment "ketchup".
Some people even use the informal term of "red sauce" to refer to ketchup.
Ketchup is also sometimes called "catsup".
Ketchup also known as "catsup" is a condiment that has a sweet and sour flavor.
Ketchup also typically now refers to tomato ketchup, although early recipes for different varieties of ketchup contained oysters, mushrooms, mussels, egg whites, grapes or walnuts, among some other ingredients.
Although the ketchup we know and eat today is mainly a tomato based condiment without those additional ingredients.
Tomato Ketchup that is commonly sold now is made from sugar, vinegar and tomatoes, along with seasonings and spices.
The word ketchup is also a corruption of the Malay word kecap, which originally meant "sauce" and came from a Chinese word kled fish brine.
British traders also adopted the term in the 17th century, and over time the recipe evolved from a fermented fish sauce to a savory vinegary concoction that is made with ingredients such as mushrooms, and finally to the modern tomato based version of ketchup that we know and use today.