. >> reporter: here's yonezawa's show of gratitude. roast pork bento, combining a classic western dish with japanese seasoning. initially the chefs paid for ingredients from their own pockets. soon farmers across japan began supplying produce. and now with online donations the project continues to grow. since it launched in april some 4,500 bentos have been delivered to 22 hospitals. >> transnslator: it's a really heartwarming meal for us. everyone at the ward apprerecias it very much. >> reporter: yonezawa has long felt a special respect for health care workers. this sentiment goes back to the birth of his daughter who received intensive medical care for a lung-related disease. >> translator: i was so grateful. i really want to show my appreciation through good food that hopefully helps to lift spirits. >> reporter: mouth watering bento, seasoned with heartfelt thanks. the volunteer chefs are just getting warmed up, setting a target of delivering 20,000 meals by the end of june. ♪ >>> authorities have arrested two americans, including