You can add almost any veggies you want in this dish, you are not really limited but this is how It is served most often, I like to add carrots too. It is so fast and easy, and figure friendly too!
Sprinkle fish with cornstarch. Heat 2 tbsp of oil and fry fish, when it's golden brown remove from wok. Clean wok, heat 1 tbsp of oil and fry garlic and onion about 1 minute, add celery, dried chili and tomato, stir and fry 4 minutes.