Back in the courtyard, Lu Yanning saw Ou Zhiyuan and Li Ruer gathered around the stone table in the courtyard, and when he got closer, they were eating a purple flake.

It looked very similar to dried sweet potatoes, but he was not sure, Lu Yanning asked, "What are you eating?"

The two of them were too involved in eating, maybe it was too delicious? Hearing the voice, they quickly got up, "I've seen Uncle Shi." ”

But at this moment, the little phoenix bird standing on Lu Yanning's shoulder shouted, "Mom, I want to eat!

Lu Yanning said helplessly, "I've taught you many times, don't call me mother, call me master, or call my brother!"

"Mom, I want to eat! I want to eat!" The little phoenix bird was afraid that she wouldn't be able to change her mouth for a while, Lu Yanning simply ignored it, pointed to the purple flakes on the table, and said to the two, "The little phoenix bird wants to eat this, can you share some with me?"

Ou Zhiyuan hurriedly picked up the plate and sent it to Lu Yanning, "Uncle Shi just take it." This is purple potato slices, steamed and dried, we also call it dried purple sweet potato. This is not a precious thing, just throw a vine on the mountain, and there will be a harvest in a few months. ”

It's really dried sweet potato!

Lu Yanning took a piece and handed it to the little phoenix bird, and the little phoenix bird directly opened his mouth and took it. Ignoring the little phoenix bird, Lu Yanning took another slice and threw it into his mouth, well, it tastes good, fragrant, sweet, and has a trace of aura.

The products of this cave world will basically bring so much aura to a greater or lesser extent, and Lu Yanning is no longer surprised.

After a while, the little phoenix bird had finished eating, and was screaming to eat again. Simply, Lu Yanning directly put the little phoenix bird on the table, pushed a plate of dried sweet potatoes in front of it, and let it take care of itself.

Li Ruer knew that Lu Yanning loved to drink tea, and she had already boiled water and was ready to make tea for him.

Lu Yanning said to Ou Zhiyuan, "Go back and help me prepare some dried purple potatoes, and it's not bad to use it as a snack for the little phoenix bird for the time being." I don't want you in vain, I saw that you have already started the Yijin Sutra, and I will find a time to teach you a set of strong vajra palms and a set of light exercises to chase cicadas in eight steps. ”

Ou Zhiyuan thanked him happily, and Lu Yanning waved his hand to let him leave first.

He sat at the table and took out the "Imperial Void Heart Sutra" given by the senior brother and studied it.

In the Imperial Void Heart Sutra, the largest space is the introduction of various medicinal materials, such as the place of origin, growth environment, form, medicinal properties, functions, etc., some unique medicinal materials and some unique records, preservation, purification, etc., which can be said to be quite detailed.

However, the medicinal materials recorded here, Lu Yanning is basically ...... I don't even know it!

Skipping the medicinal materials part, Lu Yanning turned the book to the refining part.

This part of the content is much less than the part of medicinal materials, but in fact, there is also a lot of content, such as some methods and techniques for purifying medicinal materials, as well as the basic refining process, the grasp of the heat, the method of harvesting pills, and so on. In addition to the basic part, there are also some special methods and tricks.

As for the content in the future, Lu Yanning didn't plan to look at it for the time being, and looked at the purification method first.

Among them, there is a unique purification method, which can be done empty-handed without going through the Dan furnace.

It seems quite simple to say, directly use spiritual power to fill and refine, and then use spiritual light to refine, remove impurities, and finish.

However, some of the things involved in it have special mental methods, and some other things need to be experienced and grasped by yourself in the process of practice, which is a matter of experience, and you can't talk about it in the book, you can only introduce specific methods. Of course, some common mistakes are covered in the book, which is a very detailed tutorial.

No wonder the elder brother said that this is a very suitable method for beginners.

With Lu Yanning's current mental strength, he can basically memorize it after reading it two or three times, and if he simulates it one or two times in his heart, it can be said that he has basically mastered it. The problem is that if you learn it in practice, it doesn't mean that you can get started, just like many things in our daily life, it seems that you can look at it, but it is not the case at all when you actually do it.

Flipped over the storage ring, there was really nothing suitable, and Lu Yan would rather not dare to use it to try it easily, if it was destroyed, it would be distressing.

Just as Lu Yanning was thinking about what to use to practice his hands, his eyes were aimed at the dried sweet potatoes on the table, and he thought, anyway, there is a trace of aura here, it should be okay, right?

Thinking of it, Lu Yanning took a piece of dried sweet potato in his hand, put his hands together, and silently used his spiritual power, he was very careful at first, and the slightest spiritual power input didn't seem to have any reaction?

Just as Lu Yanning was thinking about not wasting it, the little phoenix bird on the side jumped over and pecked when he opened his mouth!

Well, if it likes it, give it a good meal. Lu Yanning didn't care, put the crushed dried sweet potato in his hand aside, and let the little phoenix bird eat it by himself. And he took another piece of dried sweet potato and continued the practice of "purification".

It's a pity that no matter how careful he is, the result is - broken!

"It doesn't make sense, this dried sweet potato has been steamed and dried, and it is very tough!" Lu Yanning was a little stunned, and then opened the "Imperial Void Heart Sutra" and re-read it, and after a while, he closed the book, "It doesn't seem to be a problem?!"

At this moment, Ou Zhiyuan walked over and carried a bag of things in his hand, "Uncle Shi, this is the dried purple potato you wanted." ”

Lu Yanning was thinking about the reason for the failure of purification, and without thinking much about it, he said casually, "Put it on the table." ”

Just as Ou Zhiyuan put the dried sweet potatoes on the table and turned around to leave, Lu Yanning had a flash of inspiration and stopped him, "Do you have any fresh purple potatoes?" ”

"There are still some in the kitchen, so I'll get them for my uncle. Ou Zhiyuan trotted away.

But it was Lu Yanning who suddenly thought that this dried sweet potato might be different because it had been steamed and dried, so it was not the same, so Ou Zhiyuan went to get some fresh ones to try.

While waiting for Ou Zhiyuan, Lu Yanning casually picked up a piece of dried sweet potato on the table that had been broken by himself and threw it into his mouth, and was slightly stunned, as if it had become more delicious? No wonder the little phoenix bird would rush to eat it! This little guy is really keen!

As for why it became delicious, Lu Yanning really didn't know, and secretly guessed whether it was because of spiritual power, or maybe it was a little purified in the process? However, none of this mattered.

Lu Yanning thought that he wanted to be the first to learn this method, because there was a follow-up method behind this method, and it seemed to be very interesting, and he really wanted to learn that.