
These classic Chinese soup dumplings are filled with seasoned pork and rich gelatinized broth that melts into a savory soup as they steam. If you want tender wrappers, juicy filling, and restaurant-style xiaolongbao at home, this step-by-step recipe will guide you through it.
Make the aspic: Place the pork skin and pork neck bones in a small pot and cover with cold water. Bring to a full boil, then drain and rinse well to remove impurities.
Return the cleaned pork skin and bones to the pot. Add 4 cups (950 ml) water, the ginger slices, scallion, and Shaoxing wine. Bring to a boil, reduce to low, cover, and simmer for 2 hours.
Strain the liquid into a bowl and discard the solids. Let it cool completely, then cover and refrigerate overnight until fully set. Once firm, dice the aspic into small cubes.
Make the dough: Put the flour in a mixing bowl and add the warm water gradually, stirring as you go. Knead for 15 to 20 minutes until the dough is smooth, soft, and elastic. Cover and let rest for 30 minutes.
Make the filling: Pulse the ground pork in a food processor for 30 to 60 seconds until it becomes slightly sticky and paste-like. Transfer to a bowl and mix with the salt, sesame oil, sugar, soy sauce, and white pepper until the mixture looks smooth and airy.
Gently fold the diced aspic into the pork mixture just until combined. Cover and chill until firm. If the filling feels too soft to shape, place it in the freezer for 15 minutes before assembling.
Shape the wrappers: Lightly flour the work surface and roll the dough into a 1-inch-thick log. Cut into small, even pieces, about 11 g each, then roll each piece into a thin round about 3 to 3 1/4 inches (8 cm) wide, keeping the center slightly thicker than the edges.
Prepare the steamer by lining it with napa cabbage leaves, damp cheesecloth, or lightly oiled steamer liners so the dumplings do not stick.
Assemble the dumplings one at a time. Place about 1 tablespoon of filling in the center of each wrapper, then pleat and pinch the top closed securely. Keep the formed dumplings covered while you work so the dough does not dry out.
Set the dumplings in the lined steamer, leaving about 2 inches (5 cm) between them so they do not stick together as they expand.
Bring water to a boil in a wok or steamer pot. The water should sit below the bottom of the steamer and must not touch the dumplings. Steam over high heat for 8 minutes.
Serve immediately with Chinese black vinegar and thin matchsticks of fresh ginger. To eat, lift each dumpling carefully onto a soup spoon, nibble a small opening, sip the hot broth, then finish the dumpling in one bite.
Keep both the dough and shaped wrappers covered with a damp towel so they do not dry out. Chill the filling whenever it starts to loosen, since cold filling is much easier to pleat. Chinese black vinegar is the traditional dipping sauce; if needed, you can substitute rice vinegar, though the flavor will be milder. Leftover uncooked dumplings can be frozen in a single layer and steamed from frozen, adding 2 to 3 extra minutes.