Seahorse Radish was a condiment that was only shown in the episode "Nasty Patty."
SpongeBob stated it was 'The narliest stuff in the ocean.' It was put on the Nasty Patty when the Health Inspector came for an inspection on the Krusty Krab, because Mr. Krabs thought it was the fake Health Inspector only looking for free food. It also appeared in the episode "Employee of the Month," as SpongeBob saying: "Seahorse radish, Kinda seahorsey." It also may be noted as the Krabby Patty Secret Formula. It was also mentioned by Squidward in the episode "Band Geeks" as Horseradish.
- Seahorse Radish is an obvious parody of the real life food Horse Radish.