Prepare the ingredients: 50g beef, 15g fernbrake, 1 button mushroom, 50g cooked brown rice, 1 tsp perilla oil, and a pinch of black pepper.

Boil the soaked fernbrake in water for at least 20 minutes, then rinse under running water and squeeze out excess water.

Cut the fernbrake into bite-sized pieces and slice the button mushroom.

Heat a frying pan over medium heat and stir-fry the beef until partially cooked.

Add the fernbrake and mushroom to the pan and stir-fry together with the beef.

Add the cooked brown rice to the pan and stir-fry until everything is well combined.

Turn off the heat and drizzle 1 tsp of perilla oil over the mixture. Add a pinch of black pepper and mix well.