Lydia Shire is a legend in her own time, a culinary pioneer who featured offal on the menu at the Boston’s legendary Locke Ober Restaurant at a time when other chefs shied away from entrails. Now that the rest of the world has caught up, this intrepid chef is on a new mission: to counter the no-fat, no-fun fad that encourages eliminating butter, meat, and salt from our diets.