Punga fruit

The Wild Punga Fruit is an item added to Fallout 3 in the Point Lookout add-on.

It is a wild fruit that grows all over Point Lookout and has the effect of lowering radiation and healing you at the same time. The perk Punga Power! increases the radiation healing effects, but does not affect its HP healing.

Punga fruit is found in two variants, Wild Punga Fruit and Refined Punga Fruit.

Locations
It is said to grow well over the dead and can indeed be found near any grave site, although its overall abundance makes this claim questionable. Wild Punga Fruit can be found pretty much anywhere, while Refined Punga Fruit is cultivated at the Ark & Dove Cathedral.

Punga fruit can also be purchased from various vendors in the Wastelands. Since Tobar is trading the Punga in the Capital Wastelands, this is not too surprising.

Quests

 * A Spoonful of Whiskey - One of the items needed to complete this quest is either 10 Refined Punga Fruit or 20 Wild Punga Fruit
 * Walking with Spirits - Requires that you recover Punga Seeds