Let's take an example: first, cut the steak (or ready-made steak) and marinate it with black pepper, salt and oil for later use.
It can be served with vegetables, French fries or summer corn.
Fry the marinated steak into 3 5 7 layers, depending on your taste (I prefer 7 layers).
Finally, there is sauce, which is generally available now. Onion juice, black pepper juice, mustard juice and mushroom juice mind black pepper juice.
Low juice means stir-fry sauce, stir-fry onion and black pepper, and finally boil the stir-fry sauce and sprinkle it on the steak.
The practice of cooking juice is very complicated. Now it seems that supermarkets sell ready-made juice, and the latter can also buy boiled juice powder directly.
I don't know if this will help you, but I really tried my best.