Steak in Mushroom Gravy----Easy Crockpot Recipe

2 1/2 lb. round steak
2 tbsp. oil or shortening
1 can cream of mushroom soup
1 sm. onion, chopped
1 tsp. salt
1 tsp. Worcestershire sauce

Brown meat on both sides. Combine remaining ingredients and pour over meat. Cook on low in crock pot all day!!!