‘Sweetbitter’ Star Ella Purnell Went to Restaurant Boot Camp for Coming-of-Age Series

British actress Ella Purnell stars as Tess, a young woman who moves from Ohio to New York City after college. And like many recent grads with big ideas and small budgets, she gets a job as a server at a trendy New York restaurant. Actually, she has to train a while before she can be a real server, and she starts out as a back waiter.