Clean, devein and shell the prawns or shrimp. Slice each prawn into 4 slices lengthwise, set in a bowl and mix with egg white, salt, wine, cornstarch and marinate at least one half hour.
Peel and slice the cucumber into 2” long pieces, boil in boiling water about ½ minute, then plunge into cold water immediately. Slice or score each mushroom. Slice ham same siz