Maze Gohan

See it? On the very far left? And, here's some images of food.

At the left of the image when the Yuna and other bathhouse workers are feeding No-Face, you can make out green peas with rice. This is a type of maze gohan (混ぜご飯), which is rice mixed with some other ingredient. Another variant is matsutake rice. Matsutake mushrooms are very expensive, so mixing it up with rice (which is very much valued in Japan) is one way to further improve the meal.