Summer is the time of full explosion of energy. The energy is hot and up, and if we’re not careful we can be burned by it. The days are longest, and the nights are shortest. That provides the maximum growing time for crops. Corn for instance grows straight up, and we certainly associate corn with summer.
For macrobiotic coking that means more steaming and blanching. Long grain rice and other light grains like quinoa and millet. Light pickling, pressed salads and even a little raw is right now.