This Article Contains information directly from the Pikmin Games. This article is based off of an Enemy/Treasure/Area/Cave/Pikmin/Character from the Pikmin series of Games.
The Gherkin Gate is a lid for a pickle jar that was made by the real-life company Pinnacle Foods, and is the lid for their popular Vlasic pickle brand.
On it, it reads from top to bottom:
BIG TASTE(,) BIG CRUNCH
REFRIGERATE AFTER OPENING
DO NOT PURCHASE IF SAFETY BUTTON IS UP
This treasure is found on the mainland in the Perplexing Pool, and is found near the two Burgeoning Spiderworts. It is almost in the same place as the UV Lamp in Pikmin 1, and the tactic in getting it is just the same. Just swarm your Yellow Pikmin against the wall (being sure you have 15 or more), and lead them up carefully through the maze and then throw them up onto the high ledge so they can retrieve it.