After the barbecued pork tenderloin is washed, spread a layer of barbecued pork sauce, marinate it in a fresh-keeping bag for one night, and slice it in the oven the next day. The crispness of fried food is very simple without cooking oil. Many meats can make this crispy taste with their own oil. Spread all kinds of vegetables on the bottom, and then spread a layer of meat. When roasting, the meat oil will overflow and slowly penetrate into the dish, and this dish can be cooked well without refueling.