What traditional foods do Shanghainese eat on the solstice in summer?

Shanghainese eat cold noodles on the solstice in summer.

The custom of eating cold noodles in the summer of solstice began in Wei and Jin Dynasties, flourished in Tang and Song Dynasties, and prevailed in the late Qing Dynasty.

Cold noodles, also called water, refer to noodles eaten cold. The ingredients include noodles, vegetables, Chili oil, edible salt, monosodium glutamate, peanuts, diced mustard tuber, soy sauce and sugar.