Would you use clay butter on earth baked bread? It might sound gross on the surface, but dirt is everywhere and, since the article below was written in 1903, the earth and clay was a whole heck of a lot cleaner than it is today. Not that we don’t eat clay and dirt today. In fact, many people have taken to eating food grade diatomaceous earth and some people are turning back to eat Bentonite clay as a mineral supplement, even though news outlets are warning people not to do it.
Clay Butter
It is not generally known that in many parts of the world clay is eaten on bread as a substitute for butter. This is termed “stone butter,” and is used in many parts of Germany. In northern parts of Sweden earth is often baked in bread, and is sold in the public markets on the Italian peninsula as well as on the Italian peninsula as well as on the island of Sardinia, Persia, Nubia and other tropical countries. “Health” say this practice probably had its origin in the knowledge that all earths have some kind of flavor and take the place of salt, a necessary ingredient in all kinds of food. [Source]