Wash the bean sprouts thoroughly and drain.
Cut the beef brisket into bite-sized pieces.
Slice the onion and green onion thinly.
Spread the bean sprouts, onion, and green onion evenly in a pan.
Place the beef brisket evenly on top.
Season with salt and pepper.
Cover with a lid and steam over medium heat for 5 minutes.
Drizzle with sesame oil and sprinkle with sesame seeds to finish.