How to Make It
In a pot, heat the oil. Add the chicken and spareribs and cook over moderate heat, turning occasionally, until lightly browned, 5 minutes. Add the cardamom pods, peppercorns and star anise and cook, stirring, for 1 minute. Add all of the remaining broth ingredients and bring to a boil. Simmer over moderately low heat, skimming off the fat, until the broth is reduced to 6 cups and very fragrant, 40 minutes. Strain the broth through a cheesecloth-lined sieve into a large saucepan; skim off any fat.
In a bowl, combine all of the ingredients except the wrappers and garnishes. Arrange 4 wrappers on a surface; keep the remaining ones covered with a damp paper towel. Brush the wrapper edges with water. Place 2 teaspoons of the filling in the center of each wrapper. Bring all 4 corners of each wrapper together and twist the top gently to form into purses. Press the edges to seal. Transfer the wontons to a plate. Repeat with the remaining wrappers and filling; cover with plastic wrap.
Bring the strained broth to a boil. Add the wontons and simmer over moderate heat until cooked through, about 3 minutes. Spoon the wontons into bowls and ladle the broth over. Garnish the soup with the sesame oil, cilantro leaves and sliced scallion and serve.
Black cardamom and Sichuan peppercorns are available at penzeys.com.