Konbu is one of the main basic dashi ingredients. To make good stock, simply soak konbu in water, or heat gently in water and remove just before boiling. To make dashi konbu, kelp is washed with seawater and dried in the sun for one to two days. Konbu is rich in vitamins and minerals such as iodine. Konbu is also used in a variety of dishes such as nabe (hotpot), kobumaki (rolled konbu) and tsukudani (salted and sweetened preserved foods).