What is this? An earth oven. What does that mean? It's an oven made of clay which can attain heats of over 800 degrees. It can also hold a hot temperature for a long time. You can make pizza, bread, and anything else you would cook in a regular oven. However with the really hot temp of 800 you can make traditional italian pizzas in 3-4 minutes. With the clay and it's heat retention you can make superior breads. These guys are making 4 minute pizzas and selling them for 7 bucks.
There are all sorts of instructables on how to make one of these. Here's how I did mine..
Then you put some fire brick in there. Get it all tight and level.
We tamped these down a little more after this pic. They need to be all smooth so you can scoop up pizzas off them.
Mixing some 2 parts sand to 1 part clay. Get a 4 inch layer around your sand form.
When it's dry enough you cut out a door and pull out the sand.
All done. Time for it to dry some more. Then you slowly fire it up to dry out the clay.
The best crust, and perfect baked cheese. Only takes 3-4 minutes.
So If you would like to build one of these. I suggest the book Build your own earth oven. It rocks. Another thing I may do to my oven is to add a insulation layer over the top of the oven. It would be another straw one like at the base. I would then put a layer of clay on the outside to make it look nice.