The term 'Spaghetti Sauce Ingredient' can be summarized by two crossword solutions: OREGANO (7 letters) and Tomatopuree (11 letters). OREGANO is a fragrant, slightly bitter herb that is commonly used in Italian cuisine. It is often used to season tomato-based sauces, such as spaghetti sauce. Tomatopuree is a thick, smooth sauce made from cooked and strained tomatoes. It is a key ingredient in many Italian dishes, including spaghetti sauce.