Tartar sauce

Tartar sauce is a condiment made with mayonnaise and relish that is used by both humans and Smurfs.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, tartar sauce is made by Vino Smurf and used for serving smurf and chips, which is rarely eaten by any Smurf except for Marco and Empath. Most of the time, it is converted into Thousand Island sauce by simply adding ketchup.