McDonald’s customers craving the fast food giant’s famous Shamrock Shake struck gold this week. The popular minty green milkshake — made from McDonald’s vanilla soft serve blended with Shamrock Shake syrup and topped with whipped topping — is officially back on the menu, the company announced on Twitter, Thursday. Shamrock Shakes have have earned an impressive cult following over the years since McDonald’s first debuted the beverage in 1970. Like the McRib, Shamrock Shakes only come to the Golden Arches for a limited time.