Cut beef brisket and vegetables into bite-sized pieces.
Place the beef brisket in a pot and lightly sauté.
Top the brisket with prepared vegetables such as onion, mushrooms, bok choy, and carrots.
Mix soy sauce, mirin, sugar, and minced garlic to make the sauce.
Pour the sauce evenly over the meat and vegetables.
Cover with a lid and steam over medium heat for 10–15 minutes.
Once the ingredients are cooked, plate and serve.