Retort hnab yog dav siv nyob rau hauv lub ntim ntawm npaj txhij- rau- noj zaub mov, condiments, nqaij cov khoom, nqaij nruab deg, zaub, thiab lwm yam khoom noj uas yuav tsum tau high - kub kom tsis muaj menyuam. Piv txwv li, ua ntej- npaj pluas noj, cov kua zaub sib xyaw ua ke, thiab cov khoom noj hauv kaus poom feem ntau siv cov hnab ntim khoom noj rau kev ntim khoom, ua tiav kev lag luam kom tsis muaj menyuam los ntawm kev kub siab (feem ntau yog 121℃, 15-30 feeb) thiab txuas lub neej txee rau 61{{11}. Tsis tas li ntawd, cov hnab retort kuj tsim nyog rau kev ntim aseptic ntawm cov khoom siv kho mob thiab cov khoom siv tshuaj; lawv lub teeb yuag, yooj yim - qhib, thiab microwave-zoo yam ntxwv yog cov neeg siv khoom nyiam heev.