Relish

Relish is a topping that is used by both humans and Smurfs.

Empath: The Luckiest Smurf stories
The most common form of relish in the EMPATH: The Luckiest Smurf story series is pickle relish, which is created by Culinary Smurf and used for toppings of sandwiches as well as smurfburgers and smurf dogs.