An add-on is an additional item offered by restaurants, such as side dishes, drinks, desserts, or appetizers. These can be added on to the main dish for extra flavor or texture. For instance, toppings like cheese and olives can be used to create a delicious topping on pizza; while in pasta dishes such as lasagna, mushrooms, peppers and other vegetables can be used as an add-on to enhance the flavor. Add-ons provide extra satisfaction and indulgence to any dish.