The Strongest Teacher of the Tang Dynasty

Liu Yi, I'm from Shanmen. You country bumpkins have never even eaten stir-fry in an iron pot. Well, you must have never eaten boiled fish fillet either. Oh, you said there is no salt, but such a trivial matter as making salt is not easy to do. Li Er, as long as someone can help me solve this locust plague, I respect him as the emperor's master. So Liu Yi came, Your Majesty, is it time for you to fulfill your promise? Li Er, what, the Queen is still waiting for me. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.