Prep aromatics: Julienne the ginger. Slice the scallions to separate the white and green parts, then cut them into 3-inch (about 7.5 cm) sections. Carefully run the tip of a knife lengthwise through the scallion sections to create long, thin strips. Keep the white and green parts separate.
Make the sauce: In a small mixing cup, combine soy sauce, Shaoxing wine, sesame oil, sugar, and water. Stir well until the sugar dissolves.
Prepare the fish: Pat the fillets dry with paper towels and lightly season both sides with salt. In a shallow tray, spread out the starch and lightly coat each fillet on both sides. Dust off any excess.
Pan-sear the fish: Preheat a large (12-inch / 30 cm) nonstick skillet over medium heat with 2 tbsp of oil until it shimmers. Place the fillets skin side down and increase the heat to medium-high. Cook until golden brown and the meat flakes easily with a fork, about 4 minutes first side: 2-3 minutes second side. Pn
Keep warm: Transfer the fish to a large serving plate (skin side up) and keep warm in an unheated oven. Do not cover the plate to maintain crispness.
Make the sauce base: In the same skillet, heat the remaining 1½ tbsp oil over medium heat until shimmering. Add the ginger and scallion whites and sauté for about 30 seconds — they should sizzle without burning. Adjust heat if needed.
Finish the sauce: Add the scallion greens and pour in the sauce mixture. It will sizzle right away. Stir for 20–30 seconds until the greens just wilt, then turn off the heat.
Combine and serve: Arrange the ginger and scallion mixture over the fish fillets and pour the hot sauce on top. Serve immediately with steamed rice.
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Notes
Serve immediately: The fish tastes best right away while the skin is still crisp.
Pick thin trout fillets: Rainbow trout fillets are usually thinner than steelhead trout, ranging from about ½ inch to 1 inch thick. In general, thinner fillets (around ½ inch) take 2–3 minutes per side to pan-fry, while thicker ones (about 1 inch) need closer to 4 minutes per side.
Trout alternatives: Any thin, mild white fish fillets work well — try tilapia, flounder, sole, or whiting.
Pan type: Use a large nonstick skillet for best results and to prevent the fish from sticking.