Cavebulb

This food fills 20 units (2%) of your hunger bar, but gives no FEPs.

Eat one of them and the status effect "Glow of The Cavebulb" appears, it's a kind of temporary light source. Cavebulbs are used in Butter-steamed Cavebulb and are highly sought by players thus is very valuable in terms of trading.

How to Acquire
Cavebulbs are found in caves, with a fairly high exploration and perception requirement.

Get your Perception * Exploration over 540 and you will begin to see them.