Um, what exactly ARE those super expensive lumps hailed as "the diamond of the kitchen"? Julia hunts down all the information on truffles that you'll ever need [and maybe make you a little bit hungry in the process]. Later, take a quiz called "Truffle Shuffle"! . . . [Music: 1) Rod Hamilton, "Mushroom," 2013. Courtesy of Rod Hamilton, CC BY-NC 3.0 license; 2) Frau Holle, “Ascending Souls,” 2017. Courtesy of Frau Holle, CC BY-NC 3.0 license.]