The native guide; All about unique JapanHoly Cow! Easy-Cheesy Homemade Natto Beans Without Starter Spores
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Holy Cow! Easy-Cheesy Homemade Natto Beans Without Starter Spores

homemade Natto beans, instant pot, frozen natto, Japanese traditional food, fermented food, recipeFood & Drinks
Food & Drinks
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All ingredients and tools you need to make homemade Natto in this recipe,

  1. A instant pot with cooking bean & Yorgurt function
  2. Organic soy beans
  3. Frozen Natto beans (you can buy them at an oriental grocery store)
  4. Mini food storage containers for freezing
  5. Cheesecloth or a thin kitchen towel

So, you can go ahead to read if you are ready!

Holy Cow! Skip Soaking Beans The Night Before

Stop soaking beans the night before when using the instant pot with the bean function.

I used to soak them for 18 hours before cooking when I didn’t know the truth but I thought that I wanted to skip the process because

“So why the instant pot has the cooking bean function!”.

Also, I was not happy about Natto beans became a little mushy when they were soaked and cooked with the instant pot.

(So, you can soak beans if you like the soft texture of Natto beans.)

Holy Cow! Know You Can Make Authentic Natto Beans From Frozen Natto?

frozen natto, the oriental store, Asian store, Japanese store, Korean store

If you just like to try homemade natto beans as the new experience and you are not sure you like it out not, go get a frozen natto package at an oriental grocery store rather than buying Japanese Natto Starter Spores.

Usually, there are Japanese and Korean Natto products, and it doesn’t matter where it comes from.

Generally, three packages are one bundle and cost around $2 -$3.

Store them in a freezer when you go back home if you don’t plan to make or eat soon.


Homemade Natto Beans

CourseSide Dish


  • Instant pot with "bean" and "yogurt" functions
  • A thin cotton towel or cheesecloth
  • A colander


  • 400 g Dried Soybeans 14.1 Ounce
  • ½-1 pack Frozen Natto beans
  • Water


  • Thaw frozen Natto beans at room temperature.
  • Rinse and drain soybeans and place in an instant pot bowl.   
  • Cover the beans with 2-3 times the amount of water. Please make sure the beans are completely covered and the water will be more than 1-inch above beans.
  • Press the "Bean" button and select 45 minutes mode.
  • While beans are cooking, sanitize tools such as the strainer and a spatula.
  • Allow to naturally release until the pressure subsides, or at least 20 minutes before doing a quick release.
  • Once strain the water, immediately return the beans into the bowl and add ½-1 pack of Natto beans. Stir well them.
  • Cover the inside bowl with a thin kitchen towel or cheesecloth and then place the IP lid. (It's for avoiding water dripping in the beans.)
  • Press the "Yogurt" button and select 24 hours mode.
  • After 24 hours, if there is a white film on the surface, it's done.
  • Once it is cooked, leave them in the container if you care about the funky smell. It'll be gentle the next day.
KeywordFermented food, Vegetables

Holy Cow Tips For The Best Result

Cleaning And Sanitizing Tools

All tools used should be disinfected with boiling water before use. If germs are mixed in, it will not ferment well.

I just pouring boiled water over tools, but it is successful so far. More than welcome if you want deep sanitizing.

Rest Homemade Natto Overnight

Freshly cooked Natto beans release a charming (to me) funky smell, so let them rest in the refrigerator for about 24 hours before eating.

When natto beans is aged in the refrigerator for 24 hours, it becomes more sticky and rich without less funky smell.

It last for 2 weeks in a refrigerator.

Quick Action

Mix cooked beans and Natto beans well while cooked beans are still hot. Natto Starter Spores works well when it is stimulated by heat.

Freeze Them

Homemade Natto beans can be stored in the freezer, so it is recommended to make a large amount at a time and freeze them. Just thaw it in the room temperature.

Frozen natto can be stored for 3 months to 6 months.

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