a rice gruel cooker suited for heating in a microwave range includes a bowl , a perforated rice container placed in the bowl and having a space for accommodatng rice , and a lid held above the top end of the bowl . during heating , boiled water circulates actively through the space containing the rice and boils the rice uniformly without production of cores in rice particles despite quick heating in the microwave range . specified lid position well prevents overflow and / or scattering of boiled water during cooking .