Li Longji is more interested in solar cookers, after all, the people have to cook every day, the demand for firewood and charcoal is very huge, and it is just needed, especially in Chang'an City, which has a population of one million, if you don't need firewood and charcoal, you can cook and boil water, which will definitely benefit the people, and at the same time, it can also greatly reduce the supply pressure of firewood and charcoal in Chang'an City. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

The people of later generations, regardless of spring, summer, autumn and winter, can guarantee to take a bath once every three or two days, and when it is hot, they can wash several times a day, because the fuel supply in later generations is sufficient, solar water heaters and electric water heaters, in a very short time, can supply sufficient hot water.

Datang does not have these advanced equipment, if you want to take a bath, you must use firewood to boil water, and for a large city like Chang'an City with a population of one million, the amount of firewood that can be supplied is simply not enough to ensure that all the people can use it sufficiently, and it is still reluctant to boil water for cooking, let alone boil a lot of boiling water for bathing.

In winter, rich aristocrats can only get the opportunity to take a bath once in a long time, and ordinary people don't want to have the opportunity to take a bath all winter, and even washing their hair is a luxury, so they can only comb their hair with a grate to remove the parasites on the top of their heads.

At the same time, because firewood and charcoal have been in short supply, for this reason, the price has been high, which to a certain extent, has increased the burden of people's lives.

And the woodcutter who made a living by chopping firewood did not make a fortune, because the market of Datang is managed by officials, and there must be an official business license to sell any item.

In this way, the woodcutter's hard-working firewood can only be sold to a few families who are responsible for running the firewood business, and then they transport it into the market of Chang'an City and sell it to the people in the city.

In other words, once the solar cooker invented by Ang Lee is popularized, it will directly damage the interests of several families who monopolize the firewood business.

But Ang Lee is not afraid of these families, and his invention is a good thing for the benefit of the world, and no one has any reason to oppose it, especially those one-tenacious ministers, who will fully support the solar stove to show his noble personality of worrying about the world.

"Your Majesty, please see, this is Weichen's newly invented solar cooker."

Li An pointed to the huge solar cooker and proudly introduced.

"Well, it doesn't look too big, and it should be no problem to put it in the courtyard of the people's house."

Li Longji looked at the volume of the solar cooker and felt that the homes of ordinary people could be completely placed, that is, as long as the performance was qualified, it could be popularized on a large scale.

Li Linfu, Li Shizhi and other prime ministers were also quite interested in the solar cooker, and asked some officials about the common sense of the solar cooker, and urged Li An to hurry up and experiment.

"Your Majesty, this is a pot of cold water, do you want to try it."

Ang Lee put his hand into the pot first to show that the pot was indeed cold water.

Li Longji stretched out his hand to try it, and asked Li An to hurry up and try it.

Li Ang adjusted the sun cooker to the sun and put a pot of cold water on it.

"Li Shilang, so that you can boil the water?"

Li Longji was quite puzzled in his heart, and several prime ministers were also very curious, they knew that sunlight could indeed make cold water hot, but at that time, no matter how hot the sun was in summer and winter, it was impossible for cold water to become hot, because the heat absorbed by cold water was not yet dissipated quickly.

"Your Majesty, this cold water can not only be boiled, but also much faster than using firewood, Your Majesty can wait for a while, and use this time to show Your Majesty another function of the magnifying glass."

Ang Lee picked up a magnifying glass and a piece of shredded paper, and focused the light on the center of the paper, and soon, the paper turned black, and then, with a hula, it burst into flames.

"This ...... This magnifying glass can actually be used as a fire fold. ”

Li Longji and the ministers were all stunned at once, so that when the fire was ignited during the day, even the fire was saved.

Li An smiled and explained the principle of convex lens and concave mirror in a simple and rough way, without the need for the emperor and the prime minister to understand, just let them know a rough idea.

In the short period of time when the magnifying glass was ignited, the small pot on the sun stove was already making a gurgling boiling sound, and Li Longji and the prime ministers looked up and saw that the water in the small pot on the sun stove had been boiled.

"It's so fast, it's really a lot faster than using firewood, it's really a good thing!"

Seeing a pot of cold water, quickly heated into boiling water by a solar stove, the eyes of Li Longji and several prime ministers were full of shock and joy, this invention is too important to Datang, and it is an invention that benefits the country and the people.

"Your Majesty, the sun stove boils water more than firewood, and cooking is more delicious, Weichen will make a side dish for Your Majesty to taste."

Ang Lee's cooking skills can only be regarded as a rookie in later generations, but he can definitely be called a master in Datang, after all, in this era of Datang, the main cooking methods are boiling, steaming and roasting, and the taste of the food made is really not very good, and Ang Lee has mastered more cooking methods, and the food made is of course more delicious.

In order to demonstrate the full function of the solar stove in front of the emperor, Li Ang brought all the pots and bowls, shovels, chopsticks and other guys from the mansion, and of course, spices were indispensable.

The first dish is fried poached eggs, which is just a very ordinary dish in later generations, but there is no such way to eat in Datang, some are just boiled, in order to increase the taste, some seasonings will also be poured, but how can this compare to the fragrance of fried poached eggs?

When the bottom of the pot is heated, Ang Lee first pours in an appropriate amount of oil, and after the oil smokes, he beats the whole eggs into it one by one.

"......"

The egg liquid made a pleasant frying sound in the hot oil, and a rich aroma of food wafted around, making Li Longji and the others, who had not yet eaten lunch, unconsciously begin to swallow their saliva.

After a few tosses, three fragrant poached eggs are ready, sprinkled with some ingredients, and served on a prepared plate.

"Your Majesty, this is a poached egg made by Weichen, you can taste it."

Li An handed the most complete poached egg to Li Longji, and handed the remaining two to Li Linfu and Li Shizhi, and then started again, frying three more, there are many ministers here, at least make some more to be enough for them to taste.

Smelling the fragrance of poached eggs, Li Longji and several prime ministers' expressions were intoxicated, when people are hungry, their thirst for food is the greatest, and besides, the poached eggs made by Li An are so colorful, fragrant, and so full that it is impossible not to drool.

"Well, the taste of this poached egg is really good, Li Shilang must teach the imperial chef in the palace."

Li Longji squinted his eyes and asked intoxicatedly, and several prime ministers also ate with relish, and from time to time they sighed and tasted the taste carefully.

"Your Majesty, rest assured, poached eggs are extremely simple, and the imperial chef can learn them once they see it."

Li An said and began to prepare the second side dish, fried cucumber with eggs, this is a very delicious side dish, Li An liked to eat it very much in his previous life, and the technique of stir-frying this dish is very good, even if he came to Datang, he did not forget this technology.

The eggs are all the freshest grass eggs, there is no contamination of feed and drugs, and the cucumbers are all fresh and tender cucumbers just picked in the greenhouse, in addition, oil, salt and green onion and ginger must be prepared.

Heat the iron pot first, pour in the oil, wait for the oil to smoke, pour in the green onion and ginger to fry, let the fragrance of the green onion and ginger diffuse, and then beat the egg and stir-fry, the liquid of the egg solidifies out of the pot, otherwise it will be fried.

After cleaning the iron pot, pour in a little oil again, pour in the green onion after heating, then pour in the cucumber slices and fry for a while, then quickly pour in the eggs, sprinkle some salt and get out of the pot.

Because the iron pot prepared by Li An is relatively large, for this reason, there are more than a dozen eggs in this pot, and there are nearly ten cucumbers, which can be regarded as a big pot of rice, but Li An does it very well, and the aroma of food permeates a radius of 100 steps.

Li An scrambled a large pot of eggs and cucumbers, evenly divided them into several plates, and handed them to Li Longji and several prime ministers for them to continue tasting.

"Scrambled cucumber with eggs, it tastes good."

Li Longji took a beautiful bite, praised Ang Li with admiration, closed his eyes, and savored the food in his mouth.

"Haha! Li Shilang's cooking skills are wonderful, and it's really a pity not to be an imperial chef. ”

Li Linfu smiled very kindly, looked at Li An jokingly, and provoked a burst of laughter from the ministers and Li Longji.

Obviously, after tasting the two dishes cooked by Ang Lee himself, Li Longji and several prime ministers have recognized Ang Lee's cooking skills, and it is natural that they will equate Ang Lee's cooking skills with the imperial kitchen.

In later generations, a man who can cook, that is a standard warm man, will be recognized by the whole society, and can make many girls worship and love.

But in the era of the Tang Dynasty, being able to cook is not an advantage, and it will even be despised, Mencius's sentence 'a gentleman is far away from cooking' makes many ambitious men think that not being able to cook is what they should be, and it is the performance of a gentleman, just like some students in later generations, who think that skipping school and not doing homework are brave and awesome performances, and they are also crooked.

Li An knew that Li Linfu was making fun of himself, but there didn't seem to be any malice, after all, Li Longji and several prime ministers were here?

After smiling slightly, Li An continued to cook a few delicious meat dishes for Li Longji and several ministers, and finally burned a bean sprouts and green vegetable soup.

In short, Ang Lee's demonstration turned into a real cooking, which filled the stomachs of Li Longji and several prime ministers.

Li Longji ate very comfortably, and several prime ministers did the same, after eating and drinking, they began to sigh at the huge role of the sun cooker, and felt that Li An's invention of the sun cooker was a good thing for the benefit of the country and the people, and it was very suitable for popularization.

"Li Shilang, the inside of the sun cooker is smooth and reflective, and the manufacturing cost must be very high!"

Li Linfu asked with concern.

"It's not high, it's not high at all, since black powder was used to mine iron ore, the price of iron has dropped a lot, and the main body of the solar cooker is iron, in addition, Xia Guan invented a hand-cranked polisher, the efficiency and effect of polishing are far better than manual grinding, like such a large solar cooker, a person can polish it in an hour."

Ang Lee replied truthfully.

Regarding the polishing and polishing of metal, most of the ancient stones were used for manual polishing, which was slow and the effect was relatively poor, and the hand-cranked polisher invented by Ang Lee could polish the metal faster and better, so that the metal could reflect sunlight like a mirror.

The principle of the hand-cranked polisher is also very simple, and the manufacturing is even more simple and easy, which is of great help to the manufacture of solar cookers.

After experiencing the tremendous role of the solar cooker, several prime ministers sighed and left the Zichen Hall and returned to their respective office areas.

Li Longji stayed, carefully watched the solar cooker, and asked about some specific principles and problems that would be encountered in promotion.

For the promotion of solar cookers, the biggest problem is only the cost problem, other problems are easy to solve, and whether the cost is too high, so that the people are unwilling to buy, depends on different regions.

For example, in remote mountain villages, where there are dead trees and weeds everywhere, people do not lack firewood for cooking, and do not need to spend money, in this case, as long as they are not too rich, they should not choose to buy a solar cooker.

In an international metropolis like Chang'an, where there are a million people, the firewood needed for cooking and boiling water must be purchased at the firewood shop, and the price of firewood is relatively high.

In particular, business units such as restaurants and hostels, which have a relatively large demand for firewood, are the most in need of solar cookers, and these units are relatively wealthy and can fully afford the upfront investment costs.

For example, after buying a solar cooker, how much firewood money can be saved in a year, if the money saved for firewood in a year is enough to buy a solar cooker, the poor people must be willing to buy.

That is to say, in all cities where firewood is relatively lacking, as well as some areas where vegetation is lacking, it is very suitable for the promotion of solar stoves, of course, some areas with a lot of cloudy days are not suitable.

In addition, in addition to civilian use, solar cookers can also be used for military purposes, and many soldiers and horses of Datang are stationed in the desert, which has a great demand for fuel, and they all rely on the support of the rear.

Grain and grass! Grain and grass! To put it simply, it is grain and hay used as fuel, these two things are the most important logistical resources of an army, without which no matter how strong an army is, it will collapse.

Once a solar cooker is available, the need for forage for an army is greatly reduced, and the logistical pressure is correspondingly reduced.