To prepare the shrimp: Without cutting the shrimp, gently pull out the intestinal tract from the head end using your fingers or the tip of a toothpick. Set the cleaned shrimp aside.
To prepare the infused water: In a bowl, add the scallions and ginger. Pour in the hot water, then gently rub and press the aromatics to release their fragrance. Strain and discard the solids, reserving the infused water.
To make the filling: In a mixing bowl, add the ground pork and salt. Mix until the pork becomes slightly sticky. Add the soy sauce, dark soy sauce, Shaoxing wine, and cornstarch, then mix well. Gradually pour in the infused water in two additions, mixing thoroughly after each addition. Add the scallions and mix until combined.
To assemble the potstickers: Place about 1 teaspoon of pork filling in the center of a dumpling wrapper and top with 2 shrimp. Dab water along the edge of the wrapper, then fold and seal the center while leaving the shrimp exposed on both sides. Repeat with the remaining ingredients.
To make the dipping sauce: In a bowl, combine the soy sauce, Chinkiang vinegar, and chili oil. Mix well and set aside.
To pan-fry and steam the potstickers: In a pan over medium heat, add the cooking oil. Arrange the potstickers flat-side down and pan-fry for about 2 minutes, until the bottoms are golden. Carefully pour in the ½ cup water, partially covering the pan with the lid while adding the water to help protect against splattering. Cover completely, reduce the heat to low, and steam for about 5 minutes, until the water has evaporated and the pork and shrimp are completely cooked through.
To serve: Serve the potstickers immediately with the dipping sauce.