Wash the cabbage and shiitake mushrooms thoroughly and cut them into bite-sized pieces.
Add cooking oil to a pan and preheat over medium heat.
Add the cabbage first and stir-fry for 1 to 2 minutes.
Add the shiitake mushrooms and season with salt and pepper.
Stir-fry until the ingredients become tender.
Transfer the finished stir-fry onto a plate and serve.