Best home made oven I've used was made of mud coated over a wicker frame. As it heated and cooked the willow charred inside the mud, but the mud turned to brick.
A campfire will reach 600 C, and clay soft fires below that. Repeated firings drive off the smoke water and the carbon and the oven becomes very, very, stable.
It does need protection from the rain and wet ground though....if you try to cook in a wet oven it can spall and it ends up cracked to bits.
Loads of patterns and instructions on the net for these.
M
A campfire will reach 600 C, and clay soft fires below that. Repeated firings drive off the smoke water and the carbon and the oven becomes very, very, stable.
It does need protection from the rain and wet ground though....if you try to cook in a wet oven it can spall and it ends up cracked to bits.
Loads of patterns and instructions on the net for these.
M