As you rinse the soybeans, remove any shrunken or discolored beans.
During colder months, you may need to soak the beans longer, so it may take as many as 15 to 20 hours.
Boil any spoons or other utensils that you’ll be using to mix as well.
Nattomoto powder is also known as natto spores or natto starter. You can purchase it from Japanese grocery stores and online retailers.
If your oven temperature doesn’t go as low as 200°F (93°C), use the lowest heat setting possible. You can even go as low as 100°F (38°C) if possible.
Make sure that the jars you use have lids. Sterilize the jars in boiling water before filling them.
You can also place the jars in a food dehydrator to ferment the beans.
Natto are often served as part of a Japanese breakfast. It can also be incorporated into your meals in other interesting ways.
