Wonton Soup with Bok Choy

Ingredients

• country-style (meaty) pork ribs
  2 lb
• chicken thighs

  legs, and wings
  2 lb
• scallions

  coarsely chopped
  4 unit
• (2-inch) piece peeled fresh ginger

  chopped
  1 unit
• water
  12 cups
• bok choy

  leaves halved lengthwise, then stalks and leaves thinly sliced crosswise
  1½ lb
• salt
  1½ teaspoons
• white pepper
  ¼ teaspoon
• ground pork (not lean)
  ½ lb
• egg yolk
  1 large
• scallions

  finely chopped
  2 unit
• (1½-inch) piece peeled fresh ginger

  finely chopped
  1 unit
• soy sauce
  1 tablespoon
• rice vinegar (not seasoned)
  1 teaspoon
• Asian sesame oil
  ½ teaspoon
• salt
  ½ teaspoon
• white pepper
  ¼ teaspoon