Ketchup (/ˈkɛtʃəp/ or /ˈkɛtʃʌp/), or catsup, is a table sauce. Traditionally, different recipes featured ketchup made of mushrooms, oysters, mussels, walnuts, or other foods, but in modern times the term without modification usually refers to tomato ketchup, often called tomato sauce, or, occasionally, red sauce. It is a sweet and tangy sauce, typically made from tomatoes, a sweetener, vinegar, and assorted seasonings and spices.