This feature-length documentary offers a candid look into the world of 92-year-old British chef and cookbook author Diana Kennedy, widely regarded as the world’s authority on Mexican cuisine. Standing barely five feet tall with a still-thick English accent, Diana is a formidable critic of any individual who doesn’t agree with her subjective views on Mexican culinary traditions — or, God forbid, doesn’t recycle. Diana is a force of nature, living entirely in harmony with it. In 1974, she designed and built her ecologically sustainable property outside Zitácuaro, Michoacán, where she continues to cook, recycle rainwater, use solar power, and grow her own vegetables, coffee, and corn. She is a staunch environmentalist, maintaining a collection of plastic bags she’s reused for a decade. The author of eight cookbooks, Diana was decorated with an Order of the Aztec Eagle from the Mexican government in 1982; received a Member of the Order of the British Empire for strengthening cultural ties between Mexico and the United Kingdom in 2002; and is a 2014 inductee into the James Beard Cookbook Hall of Fame.