Teriyaki Hamberger Steak
Lightly pickled cucumber and tomato
Stewed hijiki seaweed
Boiled sweet pea
Most important thing when you make bento is "Keeping Balance of tastes".
For instance , when the main is sweet and salty like teriyaki , I would think of something sour , something plain to go with the teriyaki to balance tastes
I always think twice before making bento not to bore the person who's going to have the bento(mostly it's Me)