Background
Making oat koji can be challenging because the koji hyphae must penetrate the tough outer hulls of the grain. After several unsuccessful trials using only steaming, a refined method was developed. This approach relies on three key factors: a brief soaking window to prevent over-hydration, manual cracking of the grains prior to steaming to expose the starches, and the addition of buckwheat flour (or oat flour) post-steaming to balance moisture.
Recipe
Ingredients
Oats
Buckwheat Flour (or Oat Flour)
[Koji spores](Koji Spores)
Equipment
Steamer
Grain Mill or Mortar and Pestle
Instructions
-
Soaking
Soak the oats for a brief period to ensure they do not absorb excess water. -
Cracking
Manually break or crack the oats prior to steaming to expose the inner starches and facilitate growth. -
Steaming
Steam the cracked oats until cooked through. -
Moisture Adjustment
Toss the steamed oats with buckwheat flour to absorb excess surface moisture and create an optimal substrate. -
Inoculation
Inoculate the prepared oats with koji spores and incubate under standard conditions.
Notes and Observations
- The final batch showed promising growth, though there is still room for improvement in coverage and density.
- The resulting oat koji will be tested in various applications, including blackening, shio koji, and amazake, to assess its enzymatic strength.
