The taste of natto is special in general, mainly because natto is a fermented protein food, and it takes a long time to make. Although it smells like it is out of date, natto has a unique flavor. Natto is delicious and contains plenty of protein. Traditionally, natto is first mixed with soy sauce or Japanese mustard, stirred until silk appears, and served on rice, which is natto rice.
Matters needing attention in natto storage
It should be noted that the quality of natto can be kept at about 5℃ for about 14 days, and it can be kept at-18℃ for one year. Therefore, natto that is not eaten for the time being must be stored in the freezer, and it should be moved to the freezer for thawing 6-8 hours before eating, and it must not be thawed by microwave oven to avoid inactivation of natto bacteria.
Generally speaking, homemade fresh natto can be sealed and stored in the frozen layer of refrigerator for about a week, but in case of winter or summer, the situation changes with the seasons, so it is best to eat fresh natto as soon as possible.
Reference to the above content? Baidu encyclopedia-natto