In Japanese cuisine, green-tea rice, known as ochazuke, is a beloved comfort food. It can be as simple as green tea poured over steamed rice, but it’s often embellished with flaked fish or other toppings to make it more substantial. This version borrows from another Japanese classic: fish glazed with a miso-mirin mixture and quickly broiled. Be sure to use loose-leaf green tea; it’s typically higher quality than the bagged kind…