If you do this, you need to supplement a lot of materials and generally do not need special research. At present, many enterprises in the market are doing this. You can join their brands and recommend several companies that don't charge the joining fee. They are wind, snow sign, fresh fishing, leisure food, gluttony and so on. They are all enterprises that make finished products cold and cooked. They can be used immediately after opening the bag, which saves labor and is very convenient.