To make the infused water: In a bowl, combine the Sichuan peppercorns, scallions, and ginger. Pour in the hot water, then gently press the aromatics to release their fragrance. Strain and discard the solids, reserving the infused water.
To make the filling: In a large bowl, mix together the ground pork, salt, white pepper, soy sauce, oyster sauce, Shaoxing wine, and cornstarch. Pour in half of the infused water and mix well. Add the rest of the infused water and stir until fully absorbed. Fold in the scallions and mix until the filling is cohesive.
To make the sauce: In a bowl, combine the Sichuan peppercorn oil, chili oil, Chinkiang vinegar, soy sauce, sugar, grated garlic, grated ginger, and scallions. Whisk until fully combined.
To assemble the wontons: Brush the edges of a wonton wrapper with water. Place about 1½ teaspoons of filling in the center. Fold into a triangle and press to seal. Dab water on one of the bottom corners and press both corners together to form the classic wonton shape. Repeat with the remaining wrappers and filling.
To boil the wontons: Bring a pot of water to a boil over high heat. Add the wontons and cook for about 4 minutes, or until they float and are fully cooked.
To serve: Transfer the wontons to a bowl with a small ladle of boiling water. Drizzle the sauce generously over the top. Garnish with scallions and enjoy while hot.