Thirty-five restaurants across China, including a popular Beijing hot pot chain, have been found illegally using opium poppies as seasoning, one of the more unusual practices bedeviling the country's food regulators. Five restaurants are being prosecuted while 30 others, ranging from Shanghai dumpling joints to noodle shops in southwestern Chongqing, are under investigation, said the China Food and Drug Administration. Cases of cooks sprinkling ground poppy powder, which contains low amounts of opiates like morphine and codeine, in soup and seafood are not new in China, though it is unclear whether they can effectively hook a customer or deliver a...