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How to make Amazake (Fermented Japanese Rice Drink)

We invited Julien Clot, founder of Symbiose AlimenTerre and producer of Amazake, to share his knowledge with us.

What is AMAZAKE?

Amazake is a delicious Japanese vegetable yogurt rich in enzymes and alkaline properties. Its sweet and sour taste is reminiscent of yogurt, while its texture ranges between milk and a fat Greek yogurt, depending on preference. It is often used as an alternative to dairy products in smoothies, cereals and desserts. Amazake is made with starch-rich grains such as rice, barley, oats, buckwheat and millet. It can be kept for about 2 to 4 weeks in the refrigerator.

With more than 2,000 years of history, amazake is the result of the fermentation of the fungus, the aspergillus oryzae. This micro-organism is the basis of koji, the famous Japanese culture that produces miso, tamari, sake and several other food fermentations. Amazake is produced from koji, with fermentation as fast as 8 to 12 hours, between 32 and 60°C (90 and 140°F). Beyond this fermentation time, our yogurt becomes more and more acidulous, gradually becoming the ideal base for sake, Japanese alcohol, if yeast is added (wild or cultivated).

How to make your homemade amazake?

Making your own amazake is possible for everyone, as long as we have access to culture (inoculum) or koji. In Quebec (Canada), we are honored to have the expertise of Aliments Massawippi which, in addition to making excellent miso, produce the VitalKal a dehydrated koji, ideal for making amazake.

Ingredients & Equipment

To make this recipe, you need:

  • 1 cup of dry grains (rice, barley, oats...)
  • 2 tablespoons of VitalKal (or equivalent of koji)
  • 1 container that can hold the volume of the cooked grain (a yogurt maker would be perfect)

The steps

  1. Cook the grains
  2. Drain, and cool until it is warm
  3. Add the VitalKal (or koji)
  4. Mix well with your hands (or a spoon, but this is much less pleasant)
  5. Put everything in the container and add to the oven with the light on. (For those who have the yogurt maker, add the mixture to the yogurt maker).
  6. Ferment for 8 to 12 hours

A short fermentation (8 hours) will generally be sweet, while a long fermentation (12 to 16 hours) will be more acidic, or even alcoholic, if there is yeast in the area.

What do we do with amazake?

Amazake is as versatile as yogurt in the kitchen. Whether it's simply adding it to cereal, putting it in a smoothie or using it in muffin and cream sauce recipes, there are plenty of opportunities to use amazake!

It is natural to see sweet amazake, however it could be used in salty recipes with tamari, especially for buckwheat, brown rice and oat amazakes it as a tasty and nutritionally bioavailable condiment. In fact, we make Amazayo, a mayonnaise-style sauce made from gluten-free oats from the Gaspé Peninsula.

With the fermentation of amazake it is possible to play with the taste of it. Under the best conditions, it will be soft and sweet. With a higher fermentation (16 to 36 hours) and at the optimal temperature (30 to 40 °C - 86 to 104 °F), it will be stronger and sparkling, with a tiny alcohol taste. The longer, the more sour it will be. This allows us to make an amazake based on our preference.

For more advanced gourmets, it is possible to use amazake as a starter ferment for the famous Japanese milky pickles: kojizukes. Kojizuke literally means koji-pickle. It is therefore enough to make your amazake and once it is well fermented, you can add 5-10% salt (based on the weight). At this point the fermentation slows down quickly and we avoid the alcoholization of our amazake. We, therefore, have a kojizuke base that is rich in enzymes, which becomes an ideal substrate for the development of lactic acid bacteria. It is at this time that we immerse our vegetables in this base, for about 2 to 6 weeks and keep them at room temperature. The important thing here is that our vegetables are well covered. At the end of this fermentation period, the vegetables are both crispy and semi-firm. Kojizuke is served as a complement to amazake cream.

Kojizuke can also be used to soften and age meat. The same process is required as that for vegetables, but fermentation takes place over a maximum of 1 week and must be done and in the refrigerator. This brings the meat to an incredible level of flavor and texture, honoring its great nutritional and culinary potential.

Have fun!

By Julien Clot, Craft Fermenter and Permaculture designer @ Symbiose AlimenTerre

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