Yes build it with fire clay. Watch your facing. You can make it facing a wall if your standing in the wrong place. Add fuel, light, when the fuel burns out the oven retains the heat for some time. Add four dough loaves. They cook in two stages. Remove and add 4 more dough loaves. They can burn if left too long. It may hold enough heat to cook a third batch if you are fast and have the dough ready. Make the dough loaves before lighting so you have enough ready. The oven uses significantly less fuel per loaf than the fires. All that said my little man is still starving. I did not grow enough grain for winter. lol.