Before plant-based meats and oat milk there was tofu. It's a popular staple in Asian cooking that was first written about before the Sung dynasty in 960 AD. Bernice Chan and Alkira Reinfrank look at how tofu made its way to America in three waves that started with Benjamin Franklin, Asian immigrants in the 1800s, and finally during the hippie counterculture in the late 1960s. Featuring Renee So of Kung Wo Tofu Factory, Jenny Yang of Phoenix Bean in Chicago, Bill Shurtleff, founder and president…