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I've made NAAN a couple of times. I use Peter Reinhardt's recipie from his book on whole wheat bread recipies. I'll try to post it later. I made it on my Weber Genesis. The first time I made it, I didn't use a stone. I took a sheet pan and placed it directly on top of the flavorizer bars after removing the grates. That got me the amount of direct heat I was looking for.
As far as the home made Tandoori, Alton brown used a 4" diamond blade on an angle grinder and cut the bottom off of a large terra cotta garden pot. Then he put it upside down on the terra cotta pan it would normally sit on. So the smaller bottom was now facing up like a volcano. Then he Loaded the bottom with coal and there's the Tandoor oven.
Naan is one of my favourite breads. Not only because it tastes amazing but also the availability of varieties of naan. I always look for garlic naan whenever I visit any restaurant and 1 whole naan is enough for me. Living foodz has shared the best naan recipe which I followed to make it at home.