The adventure in Chinatown ended with a seasonal discovery: Longans.
(I was honestly looking for tapioca starch, which I haven't been able to find in any of the grocery stores.)
Longans or Dragon's Eyes are a fruit that I have only come across 3 times before, during the summer in Chinatown in Boston. The fruit is surrounded by a thin, brown skin, not quite a shell. Once its peeled away, the opaque flesh surrounds a dark brown seed. The fruit tastes a bit like a combination of lychee and sweet corn.
They are a little labor intensive, but really refreshing on a hot day.