Cook fish bones: Add water, bring to boil, add fish bone sections. Simmer for 5 minutes.
Blanch bean sprouts: Boil water, blanch bean sprouts for 1 minute. Drain and place on serving plate.
Cook fish slices: Reduce to low heat, add fish slices one by one. Remove immediately when they turn white (about 30 seconds).
Season: Add 1 tbsp salt and chicken powder to the fish broth.
Assemble: Place fish slices on bean sprouts, pour fish broth over.
Finish: Heat oil, add dried chili and Sichuan peppercorn. Pour hot oil over fish, sprinkle with scallions.
Tips
Tips: 1) Cut fish slices evenly; 2) Marinating with cornstarch makes fish more tender; 3) Keep heat low when cooking fish; 4) Final hot oil pour is the key step.