All month long, fans can rack up special rewards on Sweetgreen’s free loyalty program, Sweetpass, and upgrade to Sweetpass+ to earn even more rewards. (Graphic: Business Wire)Sweetgreen recently expanded its menu with protein plates - a new collection of options to satisfy even the non-salad eaters, adding heartier proteins and double servings of grains. (Graphic: Business Wire)LOS ANGELES--(BUSINESS WIRE)--Today, Sweetgreen (NYSE: SG), the mission-driven restaurant brand serving healthy food at scale, anno ...