Using a circular container (that is the size in terms of height of the stove you want to build) as your frame, first ensure that it has an opening at the top. Place it where you want to build the stove then around it build a mound of mud made out of clay soil. Ensure that the mound has a groove or tunnel running its length from the container. This tunnel provides the entrance through which fuel is added to the stove. Give the mound time to start drying and remove the container.
Clay can withstand very high temperatures thus making for a good stove.