Marinate the pork in soy sauce, cornstarch, and salt. Let rest for 15 minutes.
Cut off the stems, separate each stalk and wash the bok choy under running water several times, rubbing dirt off with your hands. For large bok choy, make two cuts for each stalk – one to separate the stalks in half and another to separate them from the leaves.
In a large soup pot, bring the water and chicken broth to a boil.
Toss in the ginger, garlic, salt, and bok choy. Let the broth boil again.
Simmer for 1 minute over medium heat or 2 minutes if using large bok choy.
Add pork slices, boil for 1 minute. Add noodles and boil 1 minute more.
Transfer to soup bowls and serve with sesame oil and light soy sauce. Enjoy!