Clean and prepare bean sprouts and bok choy by rinsing them thoroughly under running water.
Cut the pork belly slices into appropriate lengths.
Heat a pan and stir-fry the pork belly slices.
When the pork belly is half cooked, add the bean sprouts and bok choy.
Season with salt and pepper, and stir-fry until all ingredients are fully cooked.
Transfer the finished dish to a plate and serve.