Can this Koji be used to make Miso?

Yes you can, the Koji-Kin(fungus) you can grow it on the the grains after steaming them in a tub. I use a tub with waterbottles filled with hot tap waters. the temp needs to be around 80-86 degrees to grow for 30 hrs. make sure to gently move the rice around every 10 hrs to get it to grow evenly across the rice. I used plain medium white grains. before you steam the rice be sure to wash the rice in a plastic tub until the water is clear.Miso (みそ or 味噌 ?) is a traditional Japanese seasoning produced by fermenting soybeans with salt and koji (the fungus Aspergillus oryzae) and sometimes rice, barley, or other ingredients.

Can the Koji sit at room temperature for a few days without spoiling?

If you mean after the Koji mold has been incubated on the rice, then I would suggest refrigerating it once it's reached the desired maturity. At room temperature, it will likely continue into full maturation (turning green) and begin sporing. Many people will spore a small portion of their koji'd rice in order to have their own spores for future batches.

Can this be used to make barley koji? I want to make my own koji to then make miso. Thanks!

Yes. These are Aspergillus oryzae spores. You can grow them on whatever grain, legume, or other appropriate substrate that you choose.

Sake Kit | Desertcart South Korea

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Description

🍶 Unlock the art of sake brewing—because your home bar deserves a masterpiece!

COMPLETE BREWING KIT - Includes Koji mold spores and detailed instructions—just add rice, yeast, and citric acid to start your sake journey.
ELEVATE YOUR HOME BAR - Stand out with a unique, handcrafted beverage that sparks conversation and showcases your refined taste.
PERFECT ALCOHOL BALANCE - Achieve a refined 14-18% alcohol content, delivering that smooth, traditional sake experience every time.
AUTHENTIC JAPANESE QUALITY - Sourced directly from Japan, ensuring genuine ingredients and an unmatched brewing tradition.
BREW YOUR OWN PREMIUM SAKE - Craft up to 22 liters of authentic sake at home, impressing your friends and elevating your gatherings.

This premium Sake Kit from Japan includes Koji mold spores and instructions to brew up to 22 liters of traditional sake with 14-18% alcohol content. Designed for home brewers, it requires only medium grain rice, wine yeast, and citric acid to create an authentic, smooth sake experience.

Specifications

ASIN	B0064OGDYS
Best Sellers Rank	365,326 in Grocery ( See Top 100 in Grocery ) 326 in Sake
Body Description	Full
Body description	Full
Brand	Home Brew Ohio
Brand Name	Home Brew Ohio
Customer Reviews	4.6 out of 5 stars 232 Reviews
Flavour	unflavored
Included Components	Sake Kit
Manufacturer	Midwest Homebrewing and Winemaking Supplies
Model Number	G9-TPGG-DH5D
Part Number	G9-TPGG-DH5D

Reviews

J**A

How to brew Sake.

Fantastic product and outlines how to use and make sake on their site.

22.10.2020

Z**L

Makes very nice sake.

I use this to make sake that I then use to make rice vinegar. It works very well and I get very good sake. The vinegar that comes from it is very good also.

12.03.2026

N**K

Sake!

It works! It did make my koji rice a little yellow in appearance but my sake tasted good when it was done so it definitely works!

1.05.2025

B**L

Worked awesome

Used it to make sake , and worked awesome

12.10.2018

A**R

great

29.10.2023

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