Cut pork into bite size pieces, discarding large pieces of fat.  *See note.  In a large pot, cook the pork on medium heat until brown.  Cover and let simmer for one hour.

While the pork is cooking, slice the onions and celery.  When the pork has simmered for an hour, add the onions and celery.  Cook until tender but not mushy.

Add the spouts and chestnuts.  I drain the chestnuts a bit but do not drain the sprouts.  Stir until it is all combined.

Add the soy sauce.  You may need more than 1 cup.  Taste it along the way and decide if you want more - it is all up to your taste.  Serve over cooked rice.  

*Note:  I buy whatever size pork roast is available.  I cut the meat and weigh on a kitchen scale until I have 3.5 lbs of meat.  I freeze what is left and use for pulled pork later on.