Ice Admiral Rampage
You the Riau people would know this drink. Es Admiral Rampage has his own story about a raging admiral and slashing his sword into a quweni tree, or a mango quweni tree.
Because the fruit is falling, the surrounding community finally took and made it into a drink. Ice Rear Admiral this contents a mixture of mangoes kweni with coconut sauce cooked with sugar.
Maybe only in Riau which is still easy to find. But if you are curious, can try to come to a typical Malay restaurant.