Salad is at the core of Hetty Lui McKinnon's culinary being. For many, salad is something at the margins of our food lives — an adornment, if not something to be avoided. What might that attitude deprive us of? Since launching her career in Sydney as a cook and the author of the bestseller Community, Hetty has since moved to the United States and is now a regular contributor to the New York Times. Her new book is called Linger.