Rick's Favorite Pork Tenderloin

Preheat oven to 350 degrees.

Sear pork on both sides. Place pork in a 9 x 13 inch baking dish and sprinkle meat with seasonings. Top with onion, celery, and mushrooms. Pour in wine and bake in the onion 45 minutes to 1 hour. When done baking, remove meat from baking dish. Cover with foil to keep warm. Pour gravy mix into baking dish with wine and cooking juices, stir until thickened. Slice meat, and cover with gravy