Natto is a Japanese traditional food made from soybeans fermented with Bacillus subtilis. It is rich of proteins vitamin K and many kinds of nutrients. It also contains protease (nattokinase) which can reduces the risk of blood clotting because of it's fibrinolysis potential (no clinical data). Because of this natto kinase's ability to degrade amyloid fibrils, it is suggested that natto might prevent the amyloid-type disease such as Alzheimer's. Natto has much amount of vitamin K2 and it also contains much polyamine that has potential of suppressing excessive immune reactions.
Natto and Brown rice
Natto
Brown rice (White rice is also delicious)
Green onion
Mustard paste (Karashi)
Soy sauce