Tenderloin is lean. An optional brine or marinade can help keep it moist, but proper cooking is always your best bet to get the best result.
This versatile cut of meat is best for quick roasting, broiling, grilling, sautéing, and braising. Keyword here is quick. By itself, it's a mild-tasting meat. So think of it as a blank but juicy canvas for sauces, rubs, and marinades.