Japanese Lunch Box: Pork and Onion "Shougayaki"

My lunch today was "Shougayaki", meaning "ginger flavored sliced and fried pork". It contains pork, onion and ginger.  Depending on the thickness of pork slice, you need between 5 to 15 minutes to use a fried pan to cook it.  The thick pork like this picture will need the 15 minutes to prepare.