One of the best "improvised" cooking devices I'
m familiar with is the Hopi-Zuni "horno". It's a oven made of mud and sticks that you see in most yards on the Hopi and Zuni reservations. Look similar to the tan beehive shaped oven in brian's post, only smaller. Many thousands of people use them every day.
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"Most men take the straight and narrow. A few take the road less traveled. I chose to cut through the woods." ~Unknown~