Pour 65-70℃(149-158℉) hot water into the bowl and mix with the cooked rice. *1
Add koji to the bowl and combine them all together well.
Check the mixture temperature to make sure it is around 60℃(140℉).
Place the mixture into a rice cooker, yoghurt maker, oven, etc. (anything that can keep it at 60℃[140℉]) and leave it for about 6-8 hours, stirring occasionally. *2
If using a rice cooker, set the rice cooker on the “keep warm” setting and leave the lid slightly open with kitchen cloth covered on the top.
(optional) Put the finished amazake into a pan over medium heat for 5 minutes after it has cooked for 8 hours (do not let the temperature go above 80℃). By doing this, it will stop any further fermentation.
Pour it into a sterilized jar and keep it refrigerated for up to about 2 weeks. *3
Serve hot or leave in the fridge to cool and serve chilled!
Koji only
Place Koji in a bowl.
Pour 65-70℃ (149-158℉) hot water into the bowl and mix well.
Check the mixture temperature to make sure it is around 60℃(140℉).
Place the mixture into a rice cooker, yoghurt maker, oven, etc. (anything that can keep it at 60℃[140℉]) and leave it for about 6-8 hours, stirring occasionally. *2
Put the finished amazake into a pan over medium heat for 5 minutes after it has cooked for 8 hours (do not let the temperature go above 80℃). By doing this, it will stop further fermentation.
Pour it into a sterilized jar and keep it refrigerated for up to about 10 days. *3
Serve hot or leave in the fridge to cool and serve chilled!
Notes
*1 if the rice is cold, the hot water cools down quickly so it needs to be hotter. Please adjust.*2 I stir the mixture at 4 hours in, to make sure it's all fermented evenly. Also check the mixture temperature if it is too low like 40°C(104°F), you may want to reheat to 60 °C(140°F) but be careful not to reheat to over 70°C(158°F), otherwise it will kill the koji.*3 It can be stored in the freezer too and will last about 3 months.*4 cooking rice time is not included in the prep and cooking time.