It's very convenient to buy ground pork when it is cheap, prepare this and store it in the fridge. Pack this in your bento.
I bought a lot of ground pork while it was cheap, and it is convenient if you cook it with seasoning and store it in the fridge, so I made a lightly-flavored pork soboro.
If you mix in the sake thoroughly with the meat before frying, then it produces a fine Soboro dish.
Enjoy Japanese food around the world.