This fruit is indigenous to the Ulbukan hinterland, and any who exert the tremendous effort required to bypass its rock-like exterior are rewarded with pulp from a succulent center.
Used in recipe: Ulbuconut Milk, level 40 to 51 cooking.
This item is also used in 2 quests:
"To Laugh Is to Love" https://www.bg-wiki.com/ffxi/To_Laugh_Is_to_Love
"A Thirst for the Eons" https://www.bg-wiki.com/ffxi/A_Thirst_for_the_Eons