- 
        
        Clean the fish and cut it
              into slices of 5X4 cm.
 
        - 
        
        Mix the marinade, add the
              fish pieces and set aside.
 
        - 
        
        Soak the black mushrooms
              in hot water for 30 minutes.
 
        - 
        
        Remove and discard the
              stems and cut each mushroom into three or four slices.
 
        - 
        
        Set these aside.
 
        - 
        
        Cut the ham into thin
              slices, about the same size as the fish pieces, and set aside.
 
        - 
        
        Take four of the spring
              onions, cutting them into 4 cm pieces.
 
        - 
        
        Use only the white part
              and the part immediately next to it, discarding the roots and
              discolored stalks.
 
        - 
        
        Place the remaining two
              onions on a large plate.
 
        - 
        
        Arrange the fish, ham and
              mushrooms in layer - one piece of fish, one piece of ham and one
              piece of black mushroom, on top of the onions until all the fish,
              ham and mushrooms are used.
 
        - 
        
        Sprinkle the chopped
              onions and shredded ginger on top of them.
 
        - 
        
        Bring 4 cups of water to
              the boil in a wok.
 
        - 
        
        Put a wire rack in the wok
              and put the plate on top.
 
        - 
        
        Steam vigorously over a
              high heat for 5-7 minutes only.
 
        - 
        
        Remove the plate of fish
              from the wok, drain and set aside.
 
        - 
        
        Heat the oil in a pan, Add
              the garlic but remove it when it has browned and discard it.
 
        - 
        
        pour the oil over the
              fish, draining away any excess from the plate.
 
        - 
        
        Add all the sauce
              ingredients to a pan, stir and bring to boil.
 
        - 
        
        Pour over the fish and
              serve.