The term 'Patty Topper' is a combination of two ingredients, TOMATO (6 letters) and ONION (5 letters). TOMATO is a widely used ingredient in many dishes, and is often used as a topping for burgers. ONION is a vegetable that is also commonly used in cooking, and is often used as a topping for burgers as well. Together, the two ingredients make up the term 'Patty Topper, ' which is a popular topping for hamburgers.