Francis Lam talks to chef Sean Sherman, author of The Sioux Chef’s Indigenous Kitchen, about the diverse elements of modern Native American cuisine in North America. Contributor Shauna Sever talks to Dorie Greenspan about the ingredient she has built her career around, butter. Tucker Shaw of Cook’s Country from America’s Test Kitchen comes to the defense of pumpkin pie spice, just in the nick of time. And The Mushroom Cookbook co-author Liz O'Keefe encourages contributor David Leite to think beyond the meatiness of mushrooms, and to embrace their more fruity, spicy and herbal attributes. Also see this week's featured recipe and video for 21st Century Mac and Cheese.