Pleiogynium timoriense

Medium-sized fruit-bearing tree in the family Anacardiaceae native to Malesia, Australia and the Pacific Islands.

Pictures from wikimedia commons:

By Tatiana Gerus from Brisbane, Australia - Burdekin plums on the tree (Pleiogynium timorense)Uploaded by berichard, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=10967972

By Photo by David J. Stang - source: David Stang. First published at ZipcodeZoo.com, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=61144003
By Tatiana Gerus from Brisbane, Australia - Burdekin plum tree - fruit, seeds, leaves, trunk (3 photos)Uploaded by berichard, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=10189295