The Inky Lemonberry is a rare fruit in Ninjago, found only in a small patch in the Toxic Bogs. It can be used to brew the Tea of Insight.
History
The Inky Lemonberry once grew all over Ninjago, but became extinct by unknown means; except in the Toxic Bogs.
Shadow of Ronin
After the Ninja's memories were erased by Ronin, they and Wu traveled to the Toxic Bogs to brew the Tea of Insight so that they could find the Obsidian Weapons.