Hi Ling,
In real life, I own a cookware store; hence, I belong to a number of food, bakers', etc. organizations. One of them, the Bakers' Dozen just put together a collective cookbook of this nature(the main difference being that most of the contributors are professional chefs and most of the testers, food service professionals) I know the basic set-up involved a non-profit corp. to run the thing. However, these people already had access to agents, publishers, etc. I can ask for more information, if and when, this gets serious.