Amazake is a Japanese sweet beverage/ porridge made from koji mold and grain that can be reminiscent of a smoothie. (Mold smoothie? Yum.) Amazake is easy to make, wonderfully delicious, as well as vegan and sugar free. Its unique earthy sweetness is provided by enzymes in the koji that saccharify the grain starches into sugars. It is the infant state of sake and mirin, as amazake is the stage where sugars are being made to later convert into alcohol.
Making amazake is just mixing koji, a cooked grain, and water, and letting it incubate in a jar or sealed container for around 6-12 hours. The ratio of ingredients can be changed to your preference but a good starting place is 1:1.5:3/ koji: cooked grain: water. Incubation needs to be on the warmer side, ~120-140 degrees, as the higher temperatures are what activates sweeter results.
This is definitely a good “taste as it moves along” type recipe as you find your perfect “sweet spot.” An over mature amazake will start tasting sour (alcoholic).
When you have the amazake of your dreams incubated you can just pop it in the fridge to put the brakes on the fermentation. It’ll likely keep creeping along but you probably have a few days before it starts souring. For a refreshing summer smoothie give it a blitz in the blender, but if you do, why not also toss in a couple strawberries or whatever else you have on hand? Yum.
It’s also possible to make amazake from leftover grains from dinner as well as things like oat “milk.” To sweeten and inoculate your favorite non-dairy “milk” do a 1:3 ration of koji to “milk” and follow the same procedure.