Tenderloin is the softest part of a pork of beef's loin that is used to prepare delicious food items like the Turkey Tenderloin. Tenderloins are also used to make steaks or roasts. Easy to cook, Tenderloins serve as the perfect party or celebration food. A whole Tenderloin is often called a fillet. Tenderloins are also easily preserved in the refrigerator. Beef Tenderloin stuffed with lobster is a favourite party dish across the globe.