Fire nitrate is a commonly used medicine in the summer, but it is more often made into pills, and pharmacies do not have much stock.

The guards ran to several pharmacies in succession before each bought five catties and came back.

The color of the nitrate is reddish and large, while the miscanthus is slightly yellowish and small particles.

Li Yuanjing directly ordered someone to find two large basins, and then found two small basins, each filled half a basin with water, and put five catties of miscanthus nitrate and fire nitrate into different large basins.

Of course, these naturally don't need Li Yuanjing to do it himself, he just moved his mouth on the side, and then Liu Hu personally operated it.

"Your Highness, what is this doing?" Wang Xiaoyi was a little puzzled.

said that it was Li Yuanjing's concubine, but in fact, the two also had a relationship, but the two really didn't have much time to meet.

Li Yuanjing rarely stayed at home like today, and rarely talked to her so much like today.

Although she is a wife, Wang Xiaoyi's age is not very old, and the half-grown child is the time when her curiosity is the heaviest.

"You'll find out later!" The corners of Li Yuanjing's mouth rose slightly, revealing a mysterious smile.

Saltpeter ice, the steps are not cumbersome, you only need to throw saltpeter into a large basin, and then the small basin is also filled with water, put it in a large basin and wait.

Those who say that the blink of an eye can produce results is completely bragging, everything needs to have a process, even if it is a refrigerator, an industrial freezer cannot be so fast.

Taking advantage of this effort, Li Yuanjing ordered people to press different fruits into juice for later use, but unfortunately there was no sugar, but fortunately, there was honey in Datang, but it was more precious and the quantity was relatively small.

For Li Yuanjing, this is not a problem, I heard that there was some honey in the palace, Li Yuanjing immediately sent someone into the palace with his own warrant to ask for honey.

About half an hour later, honey was taken out of the palace, but not in large quantities.

The water in the large basin has completely turned into a large and hard block of ice, and the water in the small basin inside has also become an ice cube, but it is not as hard as the one in the large basin, and a piece of ice chips will appear when you knock it lightly.

"Get out, get out!" Li Yuanjing excitedly blasted everyone out.

From the moment the saltpeter was thrown in, he had taken secrecy measures, although everyone would know what was going on later, but at least now they didn't know.

Closing the door, Li Yuanjing smiled slightly.

There are no glasses, so you can only replace them with cups for eating tea for dinner, which is better than nothing.

Spread the crushed ice half a cup, then pour in the pressed juice, add some honey and stir well so that the ice cubes completely melt into the juice.

'Gudun ......'

Li Yuanjing, who couldn't wait, tried it himself, and then frowned slightly.

"How do you feel like a copycat?" looked at the empty cup in his hand, picked up the spoon and tasted it, "It's indeed a copycat!" ”

The sweet and sour orange juice is not at a low temperature, but there is nothing wrong with it.

It tastes better when you add ice, but that's not the case.

However, this problem is not a problem for Li Yuanjing at all, he has done countless experiments in later generations, and his favorite thing to do is to freeze iced black tea into ice cubes, and then take it out to drink, the first few sips are absolutely delicious, and at the end it is no different from drinking boiled water.

To sum it up simply, the concentration of orange juice becomes lower when the water is mixed more, so the taste is lighter, there are not so many additives as neutralization, and the feeling of drinking is naturally similar to that of a copycat drink.

There are many ways to solve this problem, such as putting orange juice in it and freezing it into ice, and then waiting for it to melt slowly, taking the first orange juice, this part is the essence, the highest concentration.

But the speed was too slow, and Li Yuanjing chose the second method without hesitation.

Continue to let the ice cubes in the small pot ferment, wait for a short time, the ice that has been cut into several pieces has been completely frozen, directly take out a piece of the bowl and put the orange juice in the pot, the other pieces into different basins, add some honey each, and then start stirring.

I kept trying the temperature of the chilled juice, and when it was almost time, I took out the ice cubes, at this time the ice cubes had only melted less than a third, but the temperature of the juice had completely dropped.

'Squeak......'

The heavy wooden door made a dull sound, and Li Yuanjing, who had been busy for most of the hour, belched beautifully.

Well, as a researcher, for the sake of the interests of customers, you must be careful and serious when researching, and do not dare to be careless, and customer satisfaction is the most important thing.

It's like a chef doesn't have to go to the table at all, taste a few bites of each pot dish to try the taste, and you will definitely gain weight without eating at the end of the day.

"Huh? How did you guys get back? Seeing that Cheng Chuliang and the others were not standing, sitting in the pavilion and blowing cowhides, Li Yuanjing couldn't help but be a little angry.

It's okay to eat and drink for nothing, but you still drink? Even if you drink, you even brought a stranger back?

"Your Highness, let me introduce you, this is my eldest brother, Cheng Chumo, I just stepped down today!" Cheng Chuliang introduced with a cheap smile.

"This king can see it......" Li Yuanjing frowned, Black Carbon No. 1, Black Carbon No. 2, a fool can also see it, let alone such a shrewd king?

I asked Cheng Chumo a few times before, but at that time, Cheng Chumo was thrown into the army by Cheng Zhijie for training, which can be regarded as a mixture of qualifications.

Recently, I don't know what Cheng Zhijie is crazy about, but he actually called Cheng Chumo back, and he said, this thing is still too young, just see the world, and then continue to go to the army to experience when he is older.

"Where's the little idea?" Li Yuanjing looked around, didn't see Wang Xiaoyi's figure, and couldn't help asking.

"Your Highness! Madame is back in the room! Liu Hu said, these cowards are back, and if the lady doesn't return to the room, can she brag with them?

Wang Xiaoyi really wants to do this, it is estimated that Li Shimin will have to give a glass of wine in the evening, there is a loss of women's morality, and there is a loss of women's morality......

"Oh, you guys come here, Liu Hu, you come too, and the ones who went shopping just now, come over too!" Li Yuanjing nodded, meritorious service will be rewarded, even if it is an errand runner, he will give some benefits.

After entering the house, Li Yuanjing beat half a pot of each juice and asked the maid to send it to Wang Xiaoyi.

Then he pointed to a few pots of juice on the table and said proudly, "Drink it!" This king rewards you! ”

"Your Highness Xie......" Liu Hu showed a sincere smile and thanked him.

If you don't do anything, it's the last time, Liu Hu will fall to the ground in fright and beg for mercy, usually only when he is given death.

But Li Yuanjing gave Wang Xiaoyi half a pot in front of them, which proves that these juices are okay, then they are the real reward.

'Gudun! Gudun! ……’

Liu Hu is a rough man, not as much as the literati, so he directly picked up a basin and put it to his mouth and drank it in a big gulp.

Even if he is the head of King Zhao's personal guard, it is difficult to taste high-end goods such as fruits and juices, and now that he has this opportunity, how can he let it go?

'Hiss......'

I thought it was just ordinary juice, but after taking a sip, Liu Hu gasped, and looked at Li Yuanjing in surprise, of course, his expression also changed a little.

A few guards beside him thought that there was something wrong with the juice, and they were quite happy, but after seeing Liu Hu's expression, they fell to their knees in fright.

"Temple...... Your Highness ......"