Mangosteen (Garcinia mangostana)

It's mangosteen (Garcinia mangostana) season. 

From Wikipedia:

The fruit of the mangosteen is sweet and tangy, juicy, somewhat fibrous, with fluid-filled vesicles (like the flesh of citrus fruits), with an inedible, deep reddish-purple colored rind (exocarp) when ripe. In each fruit, the fragrant edible flesh that surrounds each seed is botanically endocarp, i.e., the inner layer of the ovary. Seeds are almond-shaped and -sized.

In our community, where people own and work in farms, fruits sometimes define "seasons."