Clean and trim the mushrooms, then cut them into bite-size pieces.
Slice the onion and paprika into thin strips.
Add cooking oil to a pan and preheat over medium heat.
Sauté the onion for 1 minute.
Add the mushrooms and paprika. Stir-fry for 2–3 minutes.
Season with salt and pepper.
Finish with sesame oil and stir-fry once more before serving.