Oyakodon is a bowl of rice topped with simmered chicken and egg.
Japanese word, "Oyako,親子" means parents and child.
In the name of the dish, chicken is compared to parents, and egg is compared to child.
We usually simmer bite-size cut chicken and sliced onion in mildly sweet soy sauce based broth.
Add beaten egg to them, and simmer until egg start to harden.
Put them on hot rice in a bowl.
Finally, put nori or mitsuba-leaf on it.