Tocosh (also known as Togosh) is a traditional Quechua food prepared from fermented potato pulp (corn is less common). It is often prepared for celebration events and has a strong odor and flavor. Tocosh can be used as a natural antibiotic because penicillin is produced during the fermentation process. Medicinally it is used for the common cold, gastric ulcers, pneumonia, and altitude sickness among others. The Incas believed it was a gift from Inti for preservation of the body.

The fermentation process of creating tocosh was discovered by the Incas (or possibly one of the many tribes in their empire). A pool of water with a current is found or dug on the banks of a stream. The potatoes or corn are then placed in a mesh bag of grass, covered with stones, and left undisturbed for six to twelve months. The current flows through the stones to wash away bacteria during fermentation. Once fermentation has occurred, the tocosh is dried in the sun and stored for future use.

The most common preparation in the Huánuco region of Peru is to make a mazamorra or jelly-like dessert.