According to the information of Kyushu Jiejiu Catering Network, cooked oil is recommended when beef is sealed with starch. This can better lock the gravy and make the beef taste more tender and smooth. If you use raw oil, it will harden the taste of beef.

Cooked oil, also known as fish oil, is refined oil. Compared with crude oil, cooked oil has higher smoke point and lower acidity, and is more suitable for high-temperature cooking methods such as frying and frying.