Tuck narrow end of tenderloin under to create uniform thickness.u003cbr/u003e2. Take one end of a piece of food grade kitchen twine and tie a knot.u003cbr/u003e3. Make a loop with the string and put around the tenderloinu003cbr/u003e4. Pull loop snugly around beef and repeat process in 1-2 inch intervals down side of beefu003cbr/u003e5. Cut the twine when you reach the end of the tenderloin and tie another knot.