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Koji Rice: Steamed Rice Grown with Aspergillus oryzae for Two to Three Days
Koji is steamed rice grown through with the mould Aspergillus oryzae, whose enzymes turn starch to sugar for sake, miso and soy sauce. Steam the rice, cool it, mix in koji spores and keep it at about 30 °C and humid for two to three days.
The picture: our diagram, rice on a tray covered in white mould.
Intermediate
3 days
Instructions
1
1
Soak and steam
Soak and steam
Wash and soak the rice, drain it well, and steam it in a basket over boiling water until the grains are cooked but separate.
Materials for this step:
Short-grain Japanese Rice2 kgTools needed:
Wooden Tub
Steamer Basket
Large Cooking Pot
Water
Balance Scale2
2
Cool and inoculate
Cool and inoculate
Spread the rice on a tray, loosen the grains and let it cool to body warmth. Sprinkle the spores over it and mix them in evenly.
Materials for this step:
Koji Starter Spores (Aspergillus oryzae)2 gTools needed:
Rice Cooling Tray
Thermometer3
3
Grow
Grow
Cover with a damp cloth and keep the tray in a box at about 30 °C and high humidity for two to three days. Stir it now and then, spreading it thinner if it runs warm.
Tools needed:
Cotton Cloth
Wooden BoxThermometer
Water Spray Bottle4
4
Finish
Finish
After two to three days the mould has grown through the rice. Use it at once or spread it to dry.
Tools needed:
Rice Cooling Tray5
5
Keep it near 30 °C
Keep it near 30 °C
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Materials
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Tools Required
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