In a wok or small skillet, heat oil over medium high heat. When the oil is warm, break chili peppers and add them, with the Sichuan peppercorns, into the oil. Stir with a spatula until fragrant, about 40 seconds. Turn to lowest heat, carefully use a ladle to scoop out the chili pepper and peppercorn, and discard them. Immediately use a ladle to drizzle the hot oil over the fish. You should hear the sizzling of the oil when it touches the fish. Immediately pour the seasoned soy sauce onto the fish.