Boil water in a pot. When the water boils, add the dashi.
This recipe is for making dashi stock using "Hondashi," which is very popular in Japan. It comes in flakes and dissolves quickly in hot water, making it easy to make dashi. It is also sold outside of Japan, so you may be able to find it in supermarkets in your city.
In case you want to make dashi by other methods, please prepare 400 ml of dashi stock according to your preference.