Rice is the staple food of the Japanese people and the centerpiece of Japanese cuisine. In the past rice was cooked in metal pots, but these days almost all households have special electric rice cookers in their kitchens for this purpose. Rice cookers, which spread rapidly from the 1960s, make it easy to cook delicious rice.
The Japanese rice cooker optimizes heating patterns and other functions so as to produce the highly sticky rice preferred in Japan, and it is intricately designed so that anyone can prepare tasty rice. What’s more, the texture of the cooked rice can be set to your liking (hard, soft, etc.). Rice cookers for business use are also appearing that not only make ordinary rice but also adjust the heating so as to cook delicious takikomi gohan (with ingredients mixed before cooking), okowa (glutinous rice steamed with other ingredients), okayu (rice porridge), and other dishes.
The main ingredient of rice is starch.
The starch in uncooked rice consists of a large number of glucose units. If eaten in this state, which is called beta-starch, it cannot be digested and does not have any flavor. When water is added and the rice is heated, however, the grains of starch absorb the water and swell, turning into a pasty substance.
This process is called the gelatinization of starch (creating alpha-starch). In other words, cooked rice refers to the process whereby beta-starch, which cannot be eaten, is changed into delicious and digestible alpha-starch. In order to achieve gelatinization, it is necessary to heat the rice at a temperature of over 98 degrees Celsius for more than 20 minutes.
The task of cooking rice involves the process of measuring the rice -> washing the rice -> adding water -> soaking -> cooking (heating) -> steaming -> and loosening. The taste of the rice changes a lot depending on such factors as the method of washing, the length of time in which the rice is immersed in the water, and different ways of cooking.
Source: Fujmak Corporation