Beef - Stir Fry Beef with Celery and Lemon Grass

Sorry I cant quite remember the recipe for this beef dish. But i can try to remember.

Ingredients:

300g Beef (sliced)
2 tbsp oyster sauce
2 stalks celery
3 stalks lemon grass
2 chilies
1 leek (optional)
2 tbsp soy sauce

Preperation Methods:

Heat oil, fry lemon grass till fragrant, add beef, fry till surface is cooked, add rest of ingredients. Fry and cover for 2 minutes. Open lid and fry till beef is cooked.