Now bound for wider Asia, a fresh-food restaurant concept focusing on expats has caught the imagination of more than 1 million mainland Chinese. Salads, organic food and superfoods are not usually the first types of cuisine one considers staples in Mainland China, but a young American entrepreneur has hatched a fast-growing chain of quick-service restaurants serving up just that to thousands of Chinese and expat diners every day. Now the concept is heading to other Asian cities as its reputation