The term 'Teriyaki Ingredient' is commonly used to refer to two main ingredients that are used in the popular Japanese dish, Teriyaki. These two ingredients are SOY (3 letters) and GINGER (6 letters). SOY is a type of legume that is used as a source of protein in many dishes, while GINGER is a root that is used for its flavor and medicinal properties. Both SOY and GINGER are essential components of Teriyaki, and are often used together to create the unique flavor of the dish.