Mitoku Traditional Natto Spores
Product Review (submitted on December 24, 2013):
Investing in a pressure cooker makes the process of making natto so much quicker and easier. I place the soybeans on a steamer basket over water and cook them under pressure for about a half hour. I've never had a batch go bad using Mitoku spores and organically grown soybeans. Mine are incubated in a covered glass container wrapped in a towel on top of a heating pad turned on low placed inside a recycled styrofoam cooler.