Pork Tenderloin. Pork in oil is a dish with pork tenderloin as the main ingredient. It originated as a famous dish in the governmental cuisine of the Ming Dynasty and later became a traditional dish of Shanxi. This dish is usually accompanied by auxiliary ingredients such as fungus, asparagus, cucumber slices and other seasonings, as well as soy sauce, vinegar, salt and other seasonings, to produce a golden color, crispy, soft and tender, not greasy oil meat.