Patent ID: 7695749

Claim:
A method of preparing sushi rice comprising: retaining in a container cooked rice and sushi dressing in a predetermined ratio depending on an amount of the cooked rice; mixing the cooked rice and the sushi dressing in the container to perform a mixing process; performing a maturing process in which neither mixing nor cooling the cooked rice and the sushi dressing is performed; and cooling the cooked rice and the sushi dressing with air to perform a cooling process, the cooling process being performed by a plurality of cycles of a cooling-mixing process, each cycle comprising: one-cooling operation, having a standstill duration, for merely sending air while keeping the cooked rice without mixing; and another-cooling operation for sending air while mixing the cooked rice, wherein the standstill duration of the one-cooling operation is gradually prolonged in every predetermined number of the cycles; wherein, given that an operating duration, in a first cycle, of the one-cooling operation is t 1 , a prolonged duration for the operating duration of the one-cooling operation is k (k is a positive number), and an operating duration, in an n-th cycle (n is a positive integer), of the one-cooling operation is tn, an operating duration tn, in the n-th cycle (n is a positive integer), of the one-cooling operation is set in such a way as to meet an equation tn=t 1 +((n (1)×k).