In east China's Shandong Province, there is a traditional saying like this: "eat dumplings on the Winter Solstice and eat noodles on the Summer Solstice." Following the custom, people in different areas of Shandong would all have chilled noodles on this day. 
In some mountainous areas, the seasonal wheat becomes mature around the Summer Solstice. And people there take the newly harvested wheat and make pancakes and steamed buns.
Other must-have foods on the day include fresh vegetables such as balsam pears and eggs. 
In fact, these practices that is also a  cultural heritage, and reflect optimistic attitude of the people towards life.