Warning: Don’t watch this if you’re hungry and food is not immediately available. Wayne Wang directs this documentary about Cecilia Chiang, the patron saint of Soul of a BanquetChinese cooking in America. Originally intended as a memento of Chiang preparing a banquet in her apartment, it grew into a feature on the life of the woman who opened San Francisco’s famed restaurant the Mandarin in 1961. Her students over the years have included such renowned chefs as Julia Child, James Beard and Alice Waters. Soul Of A Banquet includes interviews with Chiang, now 95, along with Waters and food writer Ruth Reichl. Oscilloscope Laboratories plans a slow rollout starting this month. Seconds will be available.