Preheat oven to 350°. In a large skillet, heat oil over medium heat. Brown pork. Add onion and celery; cook until vegetables are crisp-tender. Stir in sauerkraut, noodles, soup and mushrooms; sprinkle with salt and pepper., Spoon into a greased 2-qt. baking dish. Bake, covered, stirring occasionally, until meat is tender, about 1-1/2 hours.