The present invention provides a method for preparing a soft vegetable material which is suitably used for the production of a food or a meal for, in particular, the aged persons and which holds the shape of a particular ingredient of the food. The method comprises the steps of: (1) freezing a vegetable material and then thawing the frozen vegetable material to thus form a thawed vegetable material; (2) immersing the thawed vegetable material in a dispersion containing a pectin-decomposition enzyme or a cellulose-decomposition enzyme under reduced pressure; and (3) subjecting the vegetable material, which has been immersed in the dispersion and then thawed, to a heat-treatment at a temperature for a time sufficient for deactivating the pectin-decomposition enzyme or a cellulose-decomposition enzyme. Moreover, the thawing treatment in the foregoing step (1) may likewise be carried out simultaneous with the step of the enzyme-impregnation treatment under reduced pressure.