Revive Fruit is a consumable item that cures the status ailment "Incapacitated" -- where a party member's HP has been reduced to zero -- in addition to restoring a fraction of that character's health. Its icon heavily resembles a tomato.
In Wild Arms 3, Revive Fruit cannot be bought from Roykman or any vendors and are generally found in treasure chests or dropped by/stolen from enemies and monsters in battle. In order to keep the item in stock, the player must complete Florina's sidequest at the Decaying Labyrinth in order to use the Secret Garden to cultivate more of the fruit.