Serrian salt

"The secret to our mouthwatering nerfsteak is the seasoning: a unique blend of Serrian salt, tertium, punctil and black hole pepper that's been handed down in my family for generations."

- From the menu at Dex's Diner

Serrian salt was a type of salt used by the Besalisk chef, Dexter Jettster, in Dex's Diner, his restaurant on the galactic capital planet Coruscant, before the eatery was destroyed in 19 BBY. Jettster used Serrian salt as an ingredient in his seasoning for nerfsteaks and also included the salt in the Gartro egg salad used in his Gartro egg salad sandwiches.

Behind the scenes
Serrian salt was first mentioned in Dining at Dex's, a 2009 Star Wars Hyperspace article written as an in-universe menu by Gregory Walker.