Qingping Town was a populous town with tens of thousands of people living there. There was a Wang family biscuit shop in the southern suburbs of Qingping Town, and the business was very hot. People lined up to buy it from dawn to dark.

Wang Erfu had an only son named Wang Jun, who was seventeen or eighteen years old. Originally, Wang Erfu wanted his son to study hard, get a reputation, and show off his ancestors. Who knew that Wang Jun was idle and his studies had long been wasted, so he simply kept Wang Jun by his side.

Every morning, Wang Erfu took out one or two taels of silver to send Wang Jun to the market to buy peanut oil. After selling it for a day, he could barely afford the cost. On this day, Wang Jun went to the market to buy peanut oil as usual, and happened to meet a few friends of wine and meat. Wang Jun was used to being generous, so he invited them to drink. After drinking the wine, he remembered that his father was still waiting for the ingredients at home, but there was no money in his pocket. When he walked to the grain shop, he asked the boss if he could take credit, and the boss only said that you would pay me back tomorrow. Wang Jun looked at the peanut oil and asked the boss, "I dare ask the shopkeeper, how is this peanut oil made?" The boss laughed and said, "This is simple, just grind it. You can also use lard or something to make biscuits, and the meat will be fried in the pan." Wang Jun nodded and went back.

On the way back, Wang Jun had been thinking about how to ask his father for an extra tael of silver tomorrow, and how great it would be if he could make his own oil. While thinking about it, Wang Jun walked to the Huping Bridge in the southern suburbs of Qingping Town, and only heard frogs chirping under the bridge. Wang Jun had a flash of inspiration in his mind and walked home quickly. When he closed the stall at night, Wang Jun held an oil lamp in his left hand and a net pocket in his right hand, and he would not catch half a sack of frogs. Wang Jun went back to the biscuit shop to peel the frogs, cut off two hind legs, and started frying in a large pot. After half an hour, Wang Jun could only smell the fragrance and looked into the pot and saw that a lot of oil had been boiled.

The next day, Wang Erfu took out another tael of silver and asked Wang Jun to buy peanut oil. Wang Jun pulled his father to the back room, and saw a pot full of frog legs boiled with oil, and the frog's corpse was thrown next to it. Wang Jun looked at his father proudly. Wang Erfu nodded and said, "You are really good, let's try it today." Sure enough, the people who came to buy the biscuits that day were full of praise, asking if they had changed to a new secret recipe. Previous biscuits could only be said to be food to satisfy hunger, but today's biscuits were delicious and delicious. The biscuits were sold out in less than half a day. The two men were very happy.

From then on, the two men went to catch frogs at night, peel their skins, boil oil in a large pot, and then make biscuits and sell biscuits the next day. This kind of life probably lasted more than a month, but seeing that there were not many frogs under the Tiger Ping Bridge. That night, the two of them caught another half bag of frogs, and they did not peel their skins and boil oil first. Wang Erfu prepared some wine and food, and they were really busy with business these days, and they wanted to relax. The two of them calculated that they had earned more money in the past month, which was more than they had earned in the past three years. As soon as the two of them continued to develop at this rate, they could buy a courtyard house in Qingping Town at the end of the year, and how about opening a branch in the future? Unknowingly, both of them were drunk.

Wang Erfu woke up in the middle of the night, got up in a daze, chopped the frog legs, peeled the skin, and put the oil in the pan. Then I went back to sleep.

The next morning, there were people queuing up to buy biscuits, and when they saw that the biscuit shop had not opened the door, some people came to the back room to check, and everyone pushed open the back door and screamed in shock. They saw that half Wang Jun's body was dripping blood on the chopping board, and Wang Jun's two legs were boiling oil in the pot. Everyone ran out while vomiting, and at this time Wang Erfu Liquor also woke up.

Later, people would often meet a madman in Qingping Town and ask everyone, "My biscuits are delicious, let's have one."