Wash the mushrooms thoroughly and cut them into bite-sized pieces.
Trim the water parsley and cut into 5cm lengths.
Add perilla oil to a pan and stir-fry the mushrooms.
Season the mushrooms with salt and pepper.
Add water parsley and ground perilla seed, and stir-fry briefly.
Turn off the heat, add sesame oil and mix well.
Transfer to a plate to serve.