In Shen Yu's impression, the paper mill should be a large-scale workshop that uses a lot of labor, and a series of procedures for papermaking require manpower, but the strange scene in front of him made Shen Yu stunned on the spot.

Yun's paper mill does use a lot of manpower, but the main role of these manpower is to take care of steel machinery, use steel machinery to make paper, under the same manpower, Yun's paper mill efficiency is dozens of times or even hundreds of times that of other paper mills, and the price of Yunhua paper is naturally cheaper.

Shen Yu has never seen this kind of machine that can smoke, this kind of machine is the real secret of the Yun family, don't go to the printing house Shen Yu knows that the printing factory should also use a large number of machines like the paper mill, and it is because of the use of these machines that the cost of all the token coupons is very low.

As a business-oriented family, the Shen family itself has a lot of secrets, this kind of secret is the foundation of the Shen family, and it will not be revealed at all, and the machine in the hands of the Yun family is also the secret of the Yun family, and it is impossible for outsiders to know, Shen Yu thinks that he can be brought by Yun Yi, I am afraid it is because of Shen Mengxin's relationship.

In fact, Shen Yu also thought too much, the railway track in Yunhua County is about to be completed, and then the train will appear, and the appearance of the train will be more amazing than the machines in the paper mill, so Yunyi doesn't care about bringing Shen Yu to the paper mill, and the workers of the paper mill also more or less accidentally revealed some news to the outside world, and this kind of thing does not need to be hidden.

However, after Yunyi brought Shen Yu to the paper mill, Shen Yu understood that there was no possibility for him to obtain the token coupon technology, and no family would tell outsiders the secrets of his family.

In fact, there is another way for Shen and Yun to cooperate, Shen can place an order with Yun to order a token coupon for Shen's money, but most people will not be willing to accept this method, after all, this method is too limited, Shen will not be willing to be controlled by Yun's own bank's token coupons, if Yun suddenly turns against Shen, you can directly print a large number of token coupons.

After returning to his residence, Shen Yu wrote down what he had seen and heard today on a piece of paper, and then translated a few copies in Shen's secret language, and then sent two guards of the ninth order of the day after tomorrow to return to the Shen headquarters in the northern hundred countries with a secret letter.

Shen Yu returned to his residence, Yun Yi also returned to Yun Mansion, Yun Yi didn't know that Shen Yu would tell Shen Bin about today's events, and he didn't need to know, even if he knew, he wouldn't care, after all, the northern hundred countries where the Shen family was located were too far away from Yunhua County, and it was impossible for the Shen family to attack the Yun family, you must know that the Shen family also had competitors, such as Tianxia and Datong.

At this time, Yunyi roasted sweet potatoes with the four daughters to eat.

Baking sweet potatoes is definitely the most unique way to eat sweet potatoes, Yunyi and others don't need to take sweet potatoes as a staple food, and eating sweet potatoes every few days will not look greasy.

Sometimes when there is nothing to do, Yunyi will take the four girls to bake sweet potatoes together, eating is a purpose, and the process of baking sweet potatoes is also a very interesting thing.

More than two years ago, Yunyi found the indigenously planted sweet potatoes on the land of Yingzhou, although the sweet potatoes harvested that year should be kept as seeds, but Yunyi, who had not eaten roasted sweet potatoes for a long time, intercepted more than a dozen catties of sweet potatoes and roasted the sweet potatoes with Shangguan Yuling and ate them.

In the second year, the scale of sweet potato planting expanded, harvesting hundreds of thousands of catties of sweet potatoes, some of which were brought back to Yunhua County, in addition to leaving their own (Yun's) to eat, some sweet potatoes were given by Yunyi to various families of Yunhua Department, and told them how to eat sweet potatoes, and some sweet potatoes were sent to Yun's Restaurant in Yunhua County, Yun's Restaurant has a special dish - baked sweet potatoes, the price is relatively expensive, ten silver a catty, people who eat in Yun's Restaurant feel that baked sweet potatoes are more rare, and they have ordered a taste, Then they were conquered by the sweet and delicious roasted sweet potatoes, and almost every time they came to eat at Yun's Restaurant, they would order roasted sweet potatoes until Yun's Restaurant's stock of sweet potatoes was eaten.

This year, Yingzhou has harvested more than 5 million stone of sweet potatoes, and if you want to eat all the 5 million stone sweet potatoes, it will take all the people in the three places under the Yun family to work hard for a year.

In Yingzhou, the Yun's firm bought sweet potatoes at a price of three copper and one catty, while the price of sweet potatoes sold in Yunhua County and Zezhou was four and a half copper coins and five copper coins per catty.

Compared with the five grains, the marriage of sweet potatoes is very low, the price is only half of the millet, ordinary people don't care about what to eat, mainly to fill their stomachs, but now there is a sweet potato this kind of cheap and delicious food, some people have sold the harvest of grains in their hands to Yun's firm or other merchants, and then buy sweet potatoes, sweet potatoes have become the most common food in the lives of the people in the three places under Yun's rule.

Walking on the streets of Yunhua County, every other distance, you will hear words like this.

"Baked sweet potatoes, hot roasted sweet potatoes, fresh roasted sweet potatoes."

"Baked sweet potatoes, cheaper."

Not only Yunhua County, there are a large number of vendors selling roasted sweet potatoes in other cities in Zezhou, the price of baked sweet potatoes is not expensive, the highest is only ten copper pounds, the cheap price attracts many people to buy, after buying, peel the sweet potatoes and eat them on the street.

Even because of the flood of sweet potatoes, those warriors, literati and scholars will buy baked sweet potatoes from time to time to eat, but they generally do not buy baked sweet potatoes from small sales on the street, but look for some taverns and restaurants that sell baked sweet potatoes, order a roasted sweet potato cut into slices, sit on a chair and eat it slowly, they are enjoying the taste of baked sweet potatoes.

Well, before people get tired of eating sweet potatoes, sweet potatoes will probably be a delicious food.

Although sweet potatoes are delicious, they are eaten at every meal every day, and even if they are eaten in a different way, they will be greasy, and if you eat sweet potatoes every few days and use them as "flavorings", it is expected that they will not be greasy for a long time.

Roasted sweet potatoes have become popular in the three places under the rule of the Yun family, and there is even a tendency to develop to the outside world.

According to Yunyi's understanding, some sweet potatoes have been circulated to other regions of the Dali Empire, at first Yunyi originally wanted to control the sweet potatoes, but then after thinking about it, forget it, the human beings in the entire land of Shenzhou are basically one race and speak the same language, but they belong to different countries, and when the two countries are at war, neither side will slaughter civilians, because it is very likely that these civilians will be the subjects of their country in the future.