Rub the pork with the soy sauce, sake, and potato starch.
Cut the bell pepper and bamboo shoots into thin strips.
In a frying pan, add some sesame oil, the bell peppers, and the bamboo shoots and stir fry.
Once done stir frying, remove the bell peppers and bamboo shoots, and use the leftover sesame oil to cook the pork.
When the pork is done cooking, add the bell peppers and bamboo shoots again.
Add the chicken broth and oyster sauce. Stir fry for a bit more, then you are all done.