Slice the fish fillet diagonally. Marinate with salt, white pepper, rice wine & corn starch.
In a wok (or a deep frying pan), fry dried chilli and Sichuan pepper in oil over a low heat until fragrant (do not burn them). Chop coarsely when cooled. Set aside.
In the same wok, heat up oil over a medium heat, stir in celery. Cook for 1.5 minutes or so (30 seconds if using bean sprouts instead). Transfer to a serving bowl. Set aside.
Heat up oil in the wok, fry garlic, ginger and spring onion. Add Sichuan chilli bean paste and chilli powder. Pour in water (or chicken stock). Bring it to a full boil.
Gently place the fish slices into the wok. When cooked, pour the fish and the soup onto the vegetable.
Top with fried spices and coriander. Heat up oil then pour over to sizzle the spices. Serve immediately with plain rice.
