Oyakodon is a popular dish in Japan, it is one of the must-have dishes of Japanese cuisine.
Oyakodon, rice bowl “parents and child
Oyakodon 親子丼 is part of the donburi family, that is, a large bowl of rice on which are ingredients, here among others are eggs, pieces of chicken, onions, the negi and mirin and sake, shoyu soy sauce and dashi (depending on the recipe, this may vary). Oyakodon means “parents and child in a bowl”, the parents are represented by the chicken and the child by the eggs. It is a typical Japanese dish, easily made, simple and delicious. The chicken and onions are cooked in a dashi-based sauce, a sauce rich in umami. This makes it tender and tasty, and on top of it are scrambled eggs. The whole thing is placed on a large bowl of hot rice.
In Japan, at lunch time, you have fast food as we know it, fried hamburgers, sandwich but there are also some that sell noodles and donburi for example. Okayodon is one of the most popular fast food choices for Japanese people.
Oyakodon is also served with miso soup, and tsukemono (pickled vegetables). It is a dish that is often made in bento also. You will see that in mouth, the mixture of chicken, onions, eggs and rice is very greedy and comforting. There is a sweet and salty note that is very pleasant. 
To cook this dish, the Japanese use a special utensil, it is called the Oyako Nabe. A pan with a vertical handle and a lid that is very convenient to serve a piece of oyakodon. You can still cook this dish with a regular pan.
Variations of oyakodon
There are variations of this dish with different meats:
Without the chicken pieces, this dish is called tamagodon. 
A bowl of hot rice with a soft, slobbery omelet mixed with onions.
With beef and eggs, this dish is called tanindon 他人丼 
The chicken is simply replaced by beef.
With salmon and salmon eggs 
The same “mother and child” principle, with salmon as the parent and the children with salmon eggs. This dish is called sake oyakodon 鮭 親子丼
