Step 1: In a large bowl, combine the ground chicken, minced garlic, grated ginger, soy sauce, sesame oil, and chopped scallions. Mix well until the filling is tacky.
Step 2: Place a wonton wrapper on a clean surface and add one teaspoon of filling to the center.
Step 3: Wet the edges of the wrapper with water and fold it into a triangle or a traditional nurse’s cap shape, sealing tightly.
Step 4: Place the chilli flakes and Sichuan peppercorns in a heat-proof bowl.
Step 5: Heat the vegetable oil in a small pan until smoking slightly, then pour it over the spices to create the chilli oil.
Step 6: Once the oil has cooled slightly, stir in the black vinegar and sugar.
Step 7: Bring a large pot of water to a boil and cook the wontons in batches for 3-5 minutes until they float.
Step 8: Remove the wontons with a slotted spoon and place them into serving bowls.
Step 9: Drizzle the prepared spicy oil sauce over the wontons and garnish with extra scallions if desired.
Step 10: Serve immediately while hot for the best flavor and texture.