Cut the beef brisket into bite-sized pieces.
Slice the onion, carrot, and potato into pieces suitable for eating.
Heat cooking oil in a pan and stir-fry the beef brisket.
When the beef is half-cooked, add the prepared vegetables and stir-fry together.
Add soy sauce, sugar, garlic, pepper, and other seasonings. Mix well.
Pour in water and bring to a boil.
When the ingredients are cooked and the seasoning is absorbed, simmer over low heat.
Transfer to a plate and garnish with sesame seeds and green onion.