Cyrtandra, called ha'iwale in Hawaiian, are a sort of native giant African Violet (Gesneriaceae). There are many native species across Hawai'i; this one is common around the summit area of Kīlauea volcano. On the right side of the fruit you can see a tiny native fly, Scaptomyza cyrtandrae.
Hawai'i Volcanoes National Park, Hawai'i island, Hawaii.