Over the years, there have been many guest chefs on The Martha Stewart Show. Some of them include: Mario Batali, Emeril Lagasse, Bobby Flay, Rachael Ray, Nigella Lawson, and more. Each chef brings their own unique style and flair to the show, which is one of the things that makes it so great. Stewart is always learning new techniques and recipes from these guest chefs, and viewers get to see her interact with them in a fun and informative way.