A method for producing puree or paste of an ingredient, the method comprising steps (1) to (3):
- (1) cutting an ingredient into a certain size when the ingredient is at least as large as a size predetermined for the ingredient;
- (2) performing heat sterilization for a certain period of time in a low oxygen state in a superheated steam atmosphere at a certain temperature;
- and
- (3) processing the ingredient into a puree or paste form using any one of a planetary centrifugal mixer, a millstone grinder, and a rotary cutter mixer, depending on a type of the ingredient or a finished state of the puree or paste.