Place the water, acai powder and coconut blossom sugar in a saucepan. Bring to boil.
Once it boils, reduce the heat and add the kuzu paste. Keep stirring well until the mixture becomes thick. Keep stirring for another 1-2 minutes.
Put the mixture in an ice cube tray or a container of approx. 10x10 cm and let it cool completely in the refrigerator. Once it's stiff, pop it out of the molds or cut it into small squares and pop it right out of the container.
Note: if you use white kuzu, you need less: 25-30g
We've been careful with the coconut blossom sugar, but you can easily double the amount if you don't think it's sweet enough.