makunouchi bento; traditional boxed lunch
A classic Japanese boxed lunch containing rice and an assortment of small side dishes, typically including fish, meat, and vegetables. Often associated with theater intermissions or travel.
I bought a makunouchi bento at the station and got on the Shinkansen.
幕の内弁当には、焼き魚や卵焼きが入っていることが多い。
Makunouchi bento often includes grilled fish and rolled omelet.