Wok hei is what differentiates an ordinary stir-fried dish from a perfect one. Hosts Charmaine Mok and Sam Evans speak with Post reporter Lisa Cam to discuss the art and science behind wok hei, and why it has become so beloved among Cantonese food fans. Hear from the cookbook author who first translated wok hei into English, and a Hong Kong chef who is breaking barriers by wielding the wok.