Ember Seeds
From Zelda Wiki.org
An Ember Seed
Ember Seeds are Mystical Seeds that ignite when cracked open. They can be used to light torches, burn shrubs, and cause enemies to spontaneously combust. (If you use one on a Gibdo, its wrappings will burn off, revealing the Stalfos underneath.)
These seeds grow on the aptly named Ember Tree. In Holodrum, these trees produce seeds during winter.
