Yacoon and Rattan Fruit

A Japanese man who lived in one of the Kalanguya villages hired people to plant these "yacoon." The people didn't know what they were planting, but eventually followed the Japanese man after he dug some of them up, and discovered that he eats them. They look like sweet potatoes, but you eat them raw, and they are very sweet. The Kalanguya believe that they probably have medicinal properties.
The fruit in these pictures is Rattan Fruit.