In an era of food trends and fads, one culinary tradition remains rooted in a deep history—the Jewish practice of kashrut, or keeping kosher. Kosher laws are based in biblical texts and are practiced by Jews across the world. Some of the most well-known kosher laws are the bans on eating pork or shellfish products, and on eating milk and meat at the same meal. But kosher laws also apply to processed foods, and modern Jews have had to face the question of how to ensure that their packaged foods are safe to eat. In her new book Kosher Nation: Why More and More of America's Food Answers to a Higher Authority, author Sue Fishkoff examines the kosher certification industry and its power over modern-day food manufacturing. More