Definition: Mizutengu is a Japanese term referring to an ancient, traditional Japanese method of making food from scratch using only ingredients that have been prepared and stored for long periods of time. This practice involves fermenting or salting ingredients before cooking them, which can preserve their natural flavors and textures. It's often associated with the concept of "mizutengu" in Japanese folklore, where a person who has mastered this art is said to be invincible and immortal.