Lu Dongbin, 1 of the 8 immortals
Lu is also 1 of the 3 most popular mythical figures in China, along with Guanyin and Guanyu.
Below are two lines from a classic poem attributed to immortal Lu Dongbin:
There is a world hidden in every grain
There is a universe boiling in each kettle
https://www.viewofchina.com/eight-daoist-immortals/