NETTKetchup or catsup ( / ˈkɛtʃəp, ˈkætsup, ˈkɑːtʃəp /) is a table condiment with a sweet and sour flavor. The unmodified term ("ketchup") now typically refers to tomato ketchup, [1] although early recipes for various different varieties of ketchup contained mushrooms, oysters, mussels, egg whites, grapes or walnuts, among other ingredients. [2] [3]