Teriyaki chicken is a popular teriyaki dish.
It is loved by wide generation.
And I think it is good for bento, because it is still delicious even if it get cold.
We usually marinate chicken in teriyaki sauce which is made by mixing soy sauce, mirin, sake, and sugar.
Fry marinated chicken on frying-pan until brown.
Pour teriyaki sauce and cook chicken in low heat.
( Personally, I like to sprinkle white sesame seeds on chicken.)