The senzu bean is an item that restores full Health, Hunger, Body, and Ki to the user and is used by right-clicking with the item in your hand.
The senzu bean can be obtained by any one of three ways:
Korin will give the player one senzu bean each day after morning time in the minecraft cycle has been reached.
Shenron will give the player three senzu beans per wish whenever he is summoned.
Porunga will give the player nine senzu beans per wish whenever he is summoned.
In older versions of the mod, the player could craft the senzu bean, but that was removed several updates of the mod ago.