Three times a year, my son has the task of doing something useful to society that he can do with himself as part of his school class.
First, my eldest son negotiated with the fish shop in the market so that they could hand over fish parts that they are not selling in the market. The fish store owner gladly accepted my son's request and handed out a large amount of unsaleable fish part to my son the following week.
Then, he made 'Sashimi', 'Kabuto-yaki: broiled fish head', 'Teriyaki-don', and 'Suimono: clear soup' by using Japanese cooking methods from these scraps.
This reduced food waste and satisfied our stomach.
His teacher said that he was very clever with what he did.