Trojan horse way to veganism: Slowly sneak in the sweet potatoes

Animal rights, environment, and health are the trifecta for turning to vegetarian and vegan cooking. A Gallup poll concluded that 5% of Americans consider themselves vegan. Jonathan Kauffman tells the history of veganism in his book, “Hippie Food,” and offers recipes from some favorite vegan chefs in his recent piece for the Wall Street Journal.