What oil is red oil for cold rice noodles seasoning?

Anyone who has been a chef knows what red oil is. Especially Sichuan cuisine and Hunan cuisine put the most red oil. The common practice of red oil is to boil red oil with pepper ash. Preparation: control the oil temperature at about 70% heat, add pepper ash, add some ginger, star anise, cinnamon, or add pepper. At this point, the oil temperature should not be too high. Cook for a while on low heat, put it outside the fire and let the pepper soak in the oil for a long time.