The term 'OLD-FASHIONED INGREDIENT' can be solved by the crossword solutions RYE (3 letters) and BITTERS (7 letters). RYE is a type of grain that has been used in baking and brewing for centuries. It is a popular ingredient in many classic cocktails, such as the Old-Fashioned. BITTERS are a type of alcoholic beverage made from herbs, spices, and other flavorings. They are often used to add complexity and depth to cocktails, and are an essential part of the Old-Fashioned.