Host Francis Lam talks to chef Samin Nosrat about the four elements you need to understand to make your cooking sing. She is the author of Salt, Fat, Acid, Heat: Mastering the Elements of Good Cooking. Emily Kaiser Thelin brings us the story of legendary food writer Paula Wolfert and her struggle with memory. Thelin is author of the new biography Unforgettable: The Bold Flavors of Paula Wolfert’s Renegade Life. Dan Souza of Cook’s Science brings us an update on the culinary world’s hottest ingredient, cannabis. And Tom Scocca exposes the controversy surrounding caramelized onions.