Summer power food in Japan - believe it or not, curry!
Although I still haven't quite got used to the concept, many Japanese people love to eat spicy curry when it's very hot and humid.
My mother-in-law says that it's because it helps to increase your appetite. Curry is hot and spicy, so it is easier to eat, and somehow makes you end up feeling better.
So in my experience, a lot of my tennis friends will want to get curry after a match when the heat was oppressive. So don't be surprised when people suggest curry on a scorcher of a day. Better yet, you might be the one to suggest it to your friends!