水まんじゅう mizu manjuu literally translates to “water dumpling.”
Mizu manjuu are a popular summer time treat because they are served chilled. The outside is made from kuzu starch (arrowroot 葛) which gives it the translucent effect. The inside filling which you can see through the outer layer is either azuki paste or a fruit-jelly paste. The taste is so refreshing, perfect to balance the hot summer days. And the outer appearance is so cute and delicate.
The ones in my picture are matcha 抹茶 and raspberry ラズベリー.
In Okinawa, you can find these at Shirobara confectionary (白バラ洋菓子) which has a few locations throughout Okinawan main island. Just copy and paste into Google Maps to find the closest to you.