Ketchup, or catsup, is a table sauce. Traditionally, different recipes feature ketchup made of egg white, mushrooms, oysters, mussels, walnuts, or other foods, but in modern times the term without modification usually refers to tomato ketchup, often called tomato sauce in the United Kingdom, Ireland and Australia. It is a sweet and tangy sauce, typically made from tomatoes, a sweetener, vinegar, and assorted seasonings and spices.