Beef Stroganoff For 60
["5 c. chopped onion", "1 1/4 sticks butter", "15 lb. ground beef", "2/3 c. catsup", "10 (10 1/2 oz.) cans beef broth", "10 (10 1/2 oz.) cans cream of mushroom soup", "5 tsp. salt", "2 1/2 tsp. pepper", "8 c. sour cream"]
["Saute onion in butter until golden brown. Add ground beef and cook until browned, stirring occasionally. Blend in remaining ingredients, except sour cream. Heat until bubbling. Just before serving, stir in sour cream. Serve over noodles or rice."]
["onion", "butter", "ground beef", "catsup", "beef broth", "cream of mushroom soup", "salt", "pepper", "sour cream"]