- 
        
        Peel and devein the
              prawns, leaving only the tails intact.
 
        - 
        
        Rinse the leeks well. Cut
              them first into 4cm lengths and then lengthways into find shreds.
 
        - 
        
        Slit open the chili to
              remove and discard the seeds before cutting into fine shreds.
 
        - 
        
        Cut the ginger into fine
              shreds too.
 
        - 
        
        Heat a little of the oil
              in a wok and stir-fry the leek, chili and ginger over high heat
              for 40 seconds, then push to one side of the wok.
 
        - 
        
        Return the prawns to the
              wok and stir-fry for about 1 1/2 minutes, or until just cooked
              through.
 
        - 
        
        Add the soy sauce and
              mirin to the pan.
 
        - 
        
        Mix the chicken stock and
              cornflour and pour in.
 
        - 
        
        Cook on high heat,
              stirring until thickened.
 
        - 
        
        Serve immediately.