Beef Stroganoff

2 Lbs Stew meat cut into 1 inch cubes 1 can (~10.75 oz) condensed cream of celery soup 1 can (~10.75 oz) condensed cream of mushroom soup 1 medium onion, chopped 1 jar (6 oz) sliced mushrooms, drained 1 envelope onion soup mix 1/2 teaspoon pepper 1 cup sour cream Cooked egg noodles 
 
 In slow cooker combine all ingredients except noodles and sour cream 
 cook on low for 8 hours 
 stir in sour cream 
 serve over noodles