Answer: Peripheral goods
Explanation: Those goods which are not essential to the primary good but increases the value of it are called peripheral goods.
In the given case, Jason ordered the coffee but he and his friends received waffle and cookie as complementary goods. Thus, those complementary goods will increase their level of satisfaction.
The increased satisfaction will increase the demand for the coffee which will further result in increase in its value.
Hence from the above we can conclude that the waffle and the cookie are peripheral goods.