Add light soy sauce, salt and pepper, and minced ginger. Mix well to give the pork slices a basic flavor.
In a bow, add around 2 tablespoons of water to 3 tablespoons of starch.
Pour the starch water into the marinated pork. Mix well and make sure each piece is well coated.
Make the soup
Add a pot of water to boiling with three slices of ginger. Then, turn the fire to slowest and add the pork slices one by one. You may feel the pork slices are quite sticky. I suggest wetting your hand to avoid sticking.
When all the pork slices are added, turn up the fire and add the bok choy. Continue cooking for 1 minute until the contents boil again. Add some sesame oil, salt and pepper to taste. Our healthy, light pork and bok choy is ready.