Preserved sandorica, (300 g., $1.99), also known as santol, santal, and faux mangosteen, imported from Thailand. Needed more chili salt, shown in the thin bindle at top. Better yet — assuming you're nowhere near a supply of the fresh fruit — the preserved dried version is equally tasty and less fussy.
Full Moon Market
63 Commercial St. (at Summer St.), Lynn, Massachusetts
(From a summer 2009 visit)