How to make Chongqing hot pot red oil?

The method of Chongqing hot pot red oil is as follows:

1. List of raw materials: 22kg of refined butter for chafing dish, 5kg of lard, 8kg of raw vegetable oil, Pixian watercress 1000mg, 350g of 503 spice, Neihuang New Generation 1000mg, Shizhuhong 500g, bullet 500g and Dahongpao pepper 350g.

2. Preparation of red oil: put the mixed oil into a pot, add coriander, onion and green onion when the oil is hot, fry until golden brown, take it out, add Zanthoxylum bungeanum, heat and fry until the pepper shines, remove about 80% water, add Pixian watercress to stir-fry fragrant seeds, add pepper and green pepper to stir-fry until fragrant, and add ginger and garlic to stir-fry until fragrant.