Suan cai yu features tender fish fillets in a tangy, pickled cabbage broth. A high protein, fresh family dish with comforting sour flavors.
Slice fish fillets on a bias into thin pieces and marinate with egg white, Shaoxing wine, half the salt, and white pepper for 15 minutes.
Heat 1 tbsp chili oil in a large pot on medium and add Sichuan peppercorns; sauté until fragrant, then add ginger slices and chopped scallions (reserve some for garnish).
Add suan cai to the pot and stir-fry for 2–3 minutes to release aroma, then add soybean sprouts and stir for another minute.
Pour in chicken broth and bring to a boil over high heat. Reduce to medium and simmer for 8 minutes, then add tofu cubes. Season with soy sauce and remaining salt.
Lower heat to gentle simmer. Drop in marinated fish fillets one by one; cook until just opaque and tender (about 2–3 minutes, avoid vigorous boiling to prevent breaking the fillets).
Drizzle with remaining chili oil, garnish with fresh scallions, and serve immediately in a large bowl to preserve heat and aroma.