Mianyang is one large county of Jianghan plain, three steam is three steam dish, some say it is steam fish, steam meat, evaporate chicken, some say it is steam fish, evaporate meat, steaming balls, some say that mean the powder steams the meat, steams the pearl ball, steams white pill. Steam pearl ball while being what is called, it is chop fish , meat fine and soft to feed in raw material, crowd a ball, enlarge sift, rolling, glueing polished glutinous rice, have cage steam to ripe, the polished glutinous rice is sparkling and crystal-clear and transparent after ripe, like the pearl. If does not roll and glue the polished glutinous rice to steam, call steaming white pill.