Blanch the shirataki rice in boiling water and drain well.
Thinly slice the onion and green onion.
Heat cooking oil in a pan and sauté the onion and green onion.
Add the beef brisket slices and stir-fry.
Add the blanched shirataki rice, then stir-fry with soy sauce, minced garlic, and black pepper.
Once the ingredients are well mixed, transfer to a bowl and serve.