Shinji brought home some tuna from work and we enjoyed it the first two days as sashimi and zuke (marinated in soy sauce and mirin). On day three he made tuna burgers. Leftover tuna burgers went into his bento the next day, on top of rice. Other side dishes in this bento are:
namasu (pickled daikon and carrot)
dashimaki tamagoyaki (Japanese omelet)
steamed broccoli with mayonnaise
harumaki (ground pork and vegetables spring rolls)
