Maze Gohan

At the left of the image when the yuna and bathhouse workers are feeding Kaonashi, you can make out green peas with rice. This is a type of maze gohan (混ぜご飯), basically rice mixed with some other ingredient. Another variant is matsutake rice. Matsutake mushrooms are very expensive, so mixing it up with rice, that is very much valued in Japan, is one way to make the meal go further.