Oyako means parents and children in Japanese, and oyakodon is a traditional Japanese rice bowl topped with simmered chicken and egg.
Sliced scallion (or sometimes regular onions), and other ingredients are all simmered together in a sauce and then served on top of a large bowl of rice. The name of the dish is a poetic reflection of the fact that both chicken and egg are used in the dish.
The simmering sauce varies according to season, ingredients, region, and taste. A typical sauce might consist of dashi flavored with soy sauce and mirin. Proportions vary, but usually there is three to four times as much dashi as soy sauce and mirin.
The photo is Oyakodon at the restaurant "Hinaiya" in Kichijoji Tokyo. The price is 880yen in lunch time, including iced coffee.
Each restaurant has their own secret recipe. Please enjoy the wide variety of taste of Oyakodon in various restaurants in Japan.