For example this one..? There are some recipe by google search.. Some Japanese had tried to make it in abroad. But I have never made it...😅 I've heard of yoghurt makers that can do it.
Discussion
Yes, I found that site earlier but looks like all 3 recipes require either the dry bacillus powder or some already made natto as a starter. There is no way for me to find natto in any store where I live.
I did find a chinese youtuber from Shandong who just made some without any starter culture but I worry a bit about what happens if the wrong bacillus takes over.🥴
I will keep searching.