Shandong's roasted sweet potato originated in Jinan, and Jinan's roasted sweet potato originated in Pingyin. According to historical records, during the Qianlong period of the Qing Dynasty, Emperor Qianlong and Minister Ji Yun escorted Su Xiang and other tea merchants disguised as medicinal materials, traveled to Jining, a major town in southwest Shandong, and spent the night in Pingyin County. In the evening, everyone followed Qianlong to visit the Guandi Temple in the west of Pingyin. Suddenly, they smelled a strong fragrance and sweetness, and they were busy thinking about an old man's business stall. It turned out that Yang Hang was taking out the baked sweet potato from the mud stove, which was golden and hot. Ji Yun was busy buying a piece for Gan Long. He held it warm in his hand, peeled it to reveal golden yellow, soft and scalding flesh, ate a mouthful of fragrant, sweet, waxy and hot noodles, and was busy telling everyone to buy, sell and taste it. He also told Yang Hangduo to send the baked sweet potatoes to a restaurant to eat. The next day, due to the accumulation of refugees around Pingyin, Anbaili School and An Baili School also appeared. So he kept Pingyin and dispatched soldiers to destroy Anbaili School and Unicom School, but he didn't forget to send someone to sell a roasted sweet potatoes as a meal. He kept Pingyin for a few days and wiped out Anbaili School and Unicom School, while Emperor Qianlong cured his constipation which was invalid because he ate roasted sweet potatoes in Pingyin for many years, and killed An Baili School. Pingyin roasted sweet potatoes cured his stubborn illness. Emperor Qianlong was overjoyed and praised Pingyin roasted sweet potato as "better than ginseng". Ding Jixian, the magistrate of Pingyin County, was ordered to send experts from Pingyin roasted sweet potatoes to bring fresh sweet potatoes from Pingyin to the roasted sweet potatoes of Beijing Palace for the imperial concubines of the harem. Since then, Pingyin fresh sweet potato has become a royal sweet potato, and Pingyin baked sweet potato has become a famous snack in Jinan and Shandong.
The above legend, although not necessarily true, is quite a story. Nowadays, sweet potato is used as medicine and food. Sweet potato, also known as sweet potato, sweet potato, sweet potato, sweet potato and sweet potato, belongs to the root tuber of convolvulaceae sweet potato. According to the records in Shu Min and Agricultural Administration Encyclopedia, it originated from overseas, and was introduced to Fujian Province in the Wanli period of the Ming Dynasty (A.D. 1589 ~ 1608), and gradually spread to all parts of the Central Plains. Its medicinal value is recorded for the first time in the medicinal properties of Yi Lin Compilation (about AD 1760), and its application can "quench thirst and sober up, benefit the lungs and soothe the nerves". Cooked use can "benefit qi, satisfy hunger and help grain". "Contemporary China Materia Medica" summarizes its sexual and taste functions in Volume 6 and Volume 18, saying: "It is sweet in taste and flat in nature. Meridian of spleen and kidney. " Function "tonify the middle energizer and blood, replenish qi and promote fluid production, and relax the bowels." Indications: Spleen edema, diarrhea, sores and swelling, intestinal dryness and constipation.
Modern research has confirmed that sweet potato contains protein, fat, dietary fiber, carotene, nicotinic acid, vitamins A, B, C, E, and potassium, iron, copper, selenium, calcium and other trace elements 10, so it has high nutritional value. Moreover, every100g of fresh sweet potato contains only 0.2g of fat, which generates 99 kcal of heat energy, which is 1/4 and 1/3 of that of rice respectively. It is a good low-fat and low-calorie food. In addition, a large amount of dietary fiber contained in this product cannot be digested and absorbed in the intestine. Therefore, it can not only stimulate the intestine, enhance peristalsis and promote the excretion of stool, but also has a good effect on senile constipation. At the same time, it can effectively prevent sugar from transforming into fat, which is conducive to slimming. Therefore, nutritionists call it the most balanced healthy food and the most ideal diet food. Now Japanese regard baked sweet potato as delicious and healthy food, and Europeans and Americans also use sweet potato to design ice cream, snacks, candy and so on.
However, sweet potato, like other products with the same origin of medicine and food, is not suitable for everyone. Traditional Chinese medicine believes that it is sweet, greasy and astringent, and it can't pass the stomach. If taken unreasonably, it will do harm to human body, causing abdominal distension, heartburn, acid, and even upper abdominal pain. Therefore, it is not advisable to eat too much. People with damp-heat in the spleen and stomach and food stagnation should use it with caution. Baked sweet potato is a snack.
Snacks have the characteristics of snacks. They live in a high position in the temple, far from the rivers and lakes, and have different feelings. In the cold winter, a hot sweet potato brings us warmth, happiness and the smell of roasted sweet potato, which is a landscape in winter.