• To prepare shark's fin: Heat a wok over high heat and poach the shark's fin, crabmeat and chicken in the Shao Xing wine.
• Remove heat, dish out and place in a soup plate.
• To prepare sauce: Bring chicken stock to boil and season to taste with salt, sugar and chicken stock powder.
• Add the potato starch mixture, bring to boil and remove the heat.
• Put the water, chicken, dried scallops, cuttlefish, sole and fried chicken feet in a large stock pot. Bring to a boil.
• Lower heat and simmer for 8 hours. Allow to cool, strain and set aside.
• To serve: Pour sauce around the shark's fin mixture in the soup plate.