In a pan fry, heat cooking oil over medium heat.
Sauté sliced onion with cooking oil for about 2 minutes until fragrant. Then add garlic and grated ginger and continue to cook for 1 minute.
Add beef, soy sauce, and sugar. Stir until well combined and allow them to be cooked for 3 minutes.
Add salt, sesame oil and white pepper, stir again.
Turn off the heat.
Lastly, add chopped green onion and sesame seeds.