It usually takes about 15 minutes to cook, but if it is soaked in kelp, it can be eaten after cooking for 5 minutes. When cooking kelp, turn it over at any time to make it evenly heated. It should be noted that kelp should not be soaked for a long time, usually 6 hours. If the soaking time is too long, the nutrients in kelp, such as water-soluble vitamins and inorganic salts, will also be dissolved in water, and the nutritional value will be reduced.