Japanese summer is so hot and humid..... I don't usually lose my appetite even it's too hot, but I sometime feel like having lighter dish.
In that case, Ochazuke(literally means "soaked in tea") is one choice. Ochazuke, or chazuke, is a simple Japanese dish made by pouring mainly green tea over cooked rice with savory topping such as vegetable pickles, pickled plums, broiled salted salmon, and wasabi. As you can see, it is really really easy to make and can be a quick snack too.
For Japanese, the pair of rice and tea is a must. So, Ochazuke is always good not only hot days but also chilly days. Even when we lost appetite, we can eat if it's Ochazuke. Yes, always "tea and rice"!