Japanese Nambu Iron Kettle The body of the kettle features a relief pattern and comes with its original copper lid. Crafted from pure iron, it bears the natural traces of age and use, yet remains fully functional. Nambu iron kettles are produced using traditional manual casting techniques—such as the lost-wax method—in a highly intricate process comprising over 80 distinct steps. Adhering to the principle of "one mold, one kettle," the casting mold is shattered immediately after each piece is forged, thereby guaranteeing the absolute uniqueness of every finished work.