The health benefit of Natto is tremendous (prevention of heart attacks, strokes, cancer, osteoporosis, obesity, aging and intestinal disease caused by pathogens-- see http://www.gaia21.net/natto/benefits.htm). Consider the cost of the little package available in the store, it's really worthwhile to make it yourself. The original process is detailed in http://www.gaia21.net/natto/making.pdf. I made a simplified version:
Wash and immerse the soybean (about 3 cups) in water overnight, steam in pressure cooker for one hour. Mix with one package of Natto available in a large bakery pan, cover with aluminum foil and leave it in the oven (room temperature). In weather like end of August, the fermentation process is done in two days. Make sure everything is clean, esp. oil free.
