Taboo Fruit (禁断の実, Kindan no Mi, lit. Forbidden Fruit) is an event in Tomba! 2: The Evil Swine Return.
To complete this event, the Holy Tree and A Rare Collection events must also be cleared. Once in Taboo State (use the light beam from the collector's place in Kujara Ranch), water the tree in the right end of Ranch Area (upper platform), climb it, and fly until reaching a big rock with a hole and a ladder leading down. Go down the ladder to access the Temple with the Taboo Fruit.