The Search for General Tso's Chicken is a documentary about what it says and more. I had never heard of this dish but it is possible I have eaten it. They were saying it is hugely popular in the United States. It was an intriguing history of the relationship of Chinese food in the U.S. Bottom line was that a chef from Hunan where General Tso was an important figure, moved to Taiwan and created this dish. It was copied by a chef who set up shop in New York and apparently has spread and morphed after Nixon visited China.