Separate mushrooms from their balsamic marinade and set aside. Combine 3 tbs. of oil with balsamic marinade and aged balsamic. Marinate tenderloin for at least 1 hour. Bake at 400° F uncovered for 30 minutes or until done.

Cut in 1 1/2 slices.

Stir fry mushrooms, remaining 3 Tbs. oil and pork drippings. Stir well until mixed. Serve pork with fresh salad or mashed potatoes. Top both with mushroom sauce.