Korekore

Korekore is a herb introduced in The Minish Cap manga. It never makes a visual appearance, but it gets mentioned once during the Bonus Chapter by Ezlo. He tells Vaati to find it and that it grows on the mountain beyond the Minish Woods. After searching for days after the herb, Vaati is told by other Minish that it doesn't grow on mountains. This eventually makes him return to Ezlo, where he finds out that it was a lesson to teach Vaati that you can't believe in everything you hear.