Nicolas Jammet and Jonathan Neman met at Georgetown University in 2003 and quickly bonded over their frustration at the lack of healthy food on campus. So during their senior year, along with a third friend, Nathaniel Ru, they decided to open a 500 square-foot restaurant serving fresh salads made with organic produce. They had no idea what they were doing and almost ran out of money five months in. But today, Sweetgreen has over 100 locations, and is using new technology to re-imagine the fast-casual model, even as it faces unprecedented challenges from the coronavirus crisis.