Position your oven rack in the center and preheat to 400°F. This moderate heat will gently cook the fish without drying it out.
Cut two large rectangles of parchment paper and place one fish fillet in the center of each. Drizzle 1 teaspoon of sesame oil over each fillet, letting it pool slightly around the edges. Season generously with salt and pepper — the fish should glisten with oil and seasoning.
Scatter the julienned ginger evenly over the fish fillets. The ginger will perfume the fish as it steams, so don't be shy with it.
Now for the classic parchment fold: bring the long sides of parchment up over the fish and fold them together twice to create a tight seal. Then twist and fold the short ends under the fish, creating a neat packet that will trap all the steam inside.
Place the wrapped fish packets on a rimmed baking sheet and slide into the preheated oven. The parchment should puff slightly as the moisture creates steam.
⏱ 10 min
After 10 minutes, carefully open one packet (watch for hot steam!) and test for doneness with a fork. The fish should flake easily and be opaque throughout. If you see any translucent areas, rewrap and continue cooking for another 2-3 minutes.
While the fish bakes, whisk together the water, soy sauce, Shaoxing wine, sesame oil, sugar, and white pepper in a small bowl. Taste and adjust — the sauce should be balanced between salty, sweet, and aromatic.
When the fish is perfectly cooked, carefully tear open the parchment packets horizontally — the aroma that escapes is incredible! Pour the prepared sauce evenly over each fillet, letting it mingle with the natural juices.
Finish with fresh cilantro leaves, thinly sliced scallions, and a few rings of red chili for heat and color. Serve immediately while the fish is steaming hot and the parchment is still dramatically puffed.