Mix dry ingredients together well. Cut in the shortening using a pastry blender. Mix in the water and knead until the dough is very smooth, about 15 minutes.
Grease a cast iron frying pan, including the sides, and press the dough into the pan. Bake on top of the stove over low heat. Watch carefully so that the bread does not brown or burn before the center is cooked. When the bread is free from the pan, turn the loaf over and continue to cook. The total cooking time will be about 10 minutes on each side.