Blackpepper fish filet

Actually resepi asal guna beef..since seminggu ni my kids 'pantang' so everything kena tukar to fish la...ni jun guna fish filet...resepi asal dr sini ....cnp ajelah ye...

2 tbsp sesame oil
1/2 onion, cut to thin rings
8 thin ginger slices
2 1/2 tbsp oyster sauce
1 tbsp grounded black pepper (adjust to your liking)
1 tsp grounded white pepper (adjust to your liking)
2 stalks celery, cut diagonally
1/2 green pepper, sliced to thin strips
1/2 yellow pepper, sliced to thin strips
200g stir-fry beef slices (i change to fish filet)

1. In a wok, heat sesame oil. saute ginger and onion rings till the latter is soft.
2. Add celery and bell peppers and stir fry for one minute.
3. Add oyster sauce, black pepper, white pepper, and stir to mix well.
4. Add beef slices and stir fry till the beef is no longer red. (Important note: do not over-cook beef). Serve with warm rice.