Sorry got carried away talking about business instead of lanzones fruits. Usually at the start of the season the fruits harvested are quite sour and by the end they become a lot sweeter. The outer skin is not edible and there is also a stone/seed in the middle. Difficult to describe the taste but its similar to lychee. There is also another tree called Rambutan that fruits at the same time which looks more like lychee and also has a similar taste and texture.