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1
Simmer the pork skin in water until it yields a concentrated, collagen-rich stock. Strain, cool, and refrigerate until firmly set. Cut the resulting jelly into small, uniform dice. The aspic quantity is slightly reduced relative to standard xiao long bao — the crab fat will contribute additional liquid under heat. The aspic is ready when it holds a clean edge when cut and does not slump at room temperature.
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2
Extract the roe (xie huang) from the female hairy crabs and the fat (xie gao) from the male crabs. Handle without crushing. Many chefs combine both: the orange roe provides colour; the white creaminess of the male fat provides depth. Only fresh, live hairy crab yields the correct melting richness — frozen crab is not a substitute. The combined xie fen should be visibly orange-tinged and aromatic with iodine and sweetness.
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3
Combine the ground pork with the extracted xie fen, Shaoxing rice wine, light soy sauce, grated ginger, and salt. Fold in the diced aspic. Do not overmix, and do not overfill the wrappers — the crab fat renders the filling more fluid than a standard pork mixture, making overfilled dumplings prone to breakage. The filling is correct when it holds together but feels noticeably looser and more unctuous than plain pork filling.
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4
Add the boiling water gradually to the flour, working to a smooth, pliable dough. Rest, covered, until fully relaxed. Roll portions into thin rounds — thin enough that the orange tint of the xie fen filling is faintly visible through the dough when held to the light. This translucency is both a craft marker and the visual signal that the wrapper is at the correct thickness.
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5
This is where the dish lives or dies. Pleat each wrapper to a minimum of 18 folds, sealing the crown tightly so no soup can escape during steaming. The xie fen version demands maximum craft attention: a loose or poorly sealed pleat will allow the more fluid crab filling to breach the wrapper under heat. The finished dumpling should stand upright with a neat, gathered topknot that shows no gaps.
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6
Arrange the dumplings in a bamboo steamer lined to prevent sticking. Steam over vigorously boiling water for 6–7 minutes. Do not extend the steaming time beyond 7 minutes — the thin wrapper and fluid filling require no more. The dumplings are ready when the wrappers are set, slightly translucent, and the filling is visibly swollen with liquid soup.
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7
Allow 90 seconds before eating. The xie fen filling retains heat more intensely than a standard pork filling. Serve immediately with the Chinkiang vinegar and ginger dipping sauce. The vinegar is essential: it cuts the extraordinary richness of the crab fat and roe. Bite a small hole in the wrapper; drink the soup first.