It is an old-fashioned method of adding rice koji to the porridge and keeping it warm for more than 10 hours to slowly bring out the sweetness.
In Shimane, the amazake made with rice koji made at home is called "amagayu" and "amagai-san", and it is popular for nutrition and hydration between farm work.
Even if you don't like amazake, you can thaw it a little from frozen to make it look like ice cream, which will refresh the sweetness and make it easier to eat.
Especially on hot summer days, drink amazake as an ice slurry to prevent heat stroke and recover from fatigue.
Amazake made from koji can also be drunk by pets. *Be careful not to give too much.
Of course, instead of sugar, it can also be used in baking and cooking.