Looks mysterious.... for foreign people?
Natto, fermented beans and reproduction cell of seaweed, both are supposed to be good for you.
Then added egg and graded ginger, a 1/4 cup of water and noodle soup called " mentsuyu" ( about 1/4 cup).
Before that, you need to cook udon noodle.
For this one, just followed the instruction of the package. Prepare boiled hot water, cook udon in there for 6 min. Wash the noodle in cool water.