A lady I used to work with in Watsonville, California many moons ago gave me a copy of this recipe from her cookbook. If anyone knows the name of the cookbook, do tell! I love this recipe. The intro says, "There are many chicken hashes, the most renowned perhaps being the version that is served at New York's 21 Club. That was the inspiration for this particular dish. If there is any trick to making an outstanding hash it is to use top quality, very well-trimmed chicken." They recommend serving it with a puree of peas garnish (by spoon or pastry bag) around the edge of the completed casserole.