Sernpidalian mayo-ketchup

Sernpidalian mayo-ketchup was a condiment used in Dexter Jettster's restaurant on the planet of Coruscant, Dex's Diner, before the establishment was destroyed in 19 BBY. A customer could ask for it to be served with any slider on the menu.

Behind the scenes
Sernpidalian mayo-ketchup is mentioned in a Star Wars Hyperspace-exclusive release, Dining at Dex's by Gregory Walker, which represents the in-universe menu of Dex's Diner. In real life, ketchup is a popular condiment made from tomatoes.