Place the dried mushrooms into a medium size bowl and cover with warm water for 90 minutes. Remove the stems and return back into the bowl.
In a medium skillet heat add chicken fat and when the chicken fat start to roll add in the mushroom and sauté for minute add broth, oyster sauce and sugar. Simmer over a low heat and reduce the broth mixture by half. Braising time is about six hours.
In a wok add in the salt and water and bring to a rolling boil and add gai lan and return back to a rolling boil until al dente. Pour into colander to drain and place into a large serving platter.