In northern summer, we usually eat noodles, jiaozi, eggs, lotus seed soup and mutton soup. Before and after the Great Summer, it is the hottest, fastest growing and most critical period in a year. Since it is a hot season, people pay great attention to their diet in the dog days, which is called "sticking fat" in the north. At this time, the custom of northerners is to eat noodles, jiaozi, eggs and so on.

According to historical records, the eating habit of eating noodles on a rainy day began at least during the Three Kingdoms period. Because every dog days, people's appetite is not good, and in the traditional customs of China people, pasta is the food to satisfy their appetite. In the past, people's living conditions were poor, and they had a bad appetite in the bitter summer. When they fell asleep, they just finished harvesting wheat. Eating jiaozi was a way to improve their lives.

Traditional Chinese medicine believes that lotus seeds are sweet and flat, and have the functions of nourishing the spleen and astringent intestines, nourishing the heart and benefiting the kidney. Drinking lotus seed soup every day in summer can strengthen the heart and strengthen the will, nourish the mind and benefit the spleen. Middle-aged and elderly people eat it, which makes people healthy and healthy. It is scientific to drink lotus seed soup in summer to prolong life.

In southern Shandong, there is a custom of "drinking summer sheep" (that is, drinking mutton soup) when the summer heat comes. In Zaozhuang, Shandong Province, many citizens want to "drink summer sheep" on summer day, which is said to be related to local farming and climate. Zaozhuang is a famous wheat producing area. At the time of lodging, it was the end of the wheat harvest and the listing of new noodles, which was a short slack season.