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1
Mix flour with salt; slowly add boiling water while stirring with chopsticks until shaggy; knead 3 minutes until smooth. Rest 20 minutes.
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2
Chill pork stock until set to jelly; mix into ground pork with shrimp, ginger, scallions, soy sauce, sesame oil, and sugar.
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3
Refrigerate filling 2 hours until cold and stock is fully set.
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4
Roll dough into 12 mm rope; cut into 20 pieces and flatten each into 6 cm thin disc.
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5
Place 8 g filling in center; gather edges above filling and pleat to create purse shape with open top.
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6
Steam in bamboo baskets lined with parchment, 5 cm apart, for 8–10 minutes until dough is translucent and filling is cooked through.
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7
Serve immediately in baskets with black vinegar and sliced ginger on the side.