Green Bean Casserole
["1 medium onion, diced", "2 Tbsp. margarine", "2 Tbsp. flour", "2 Tbsp. water", "1 tsp. salt", "1/2 tsp. black pepper", "2 Tbsp. lemon juice", "2 cans green beans, drained or 4 c. green beans", "3/4 c. mushrooms, sauteed", "1 c. sour cream", "1/2 c. shredded Cheddar cheese", "1/2 c. seasoned bread crumbs"]
["Saute onions in margarine.", "Gradually stir in flour, water, salt, pepper and lemon juice.", "Simmer 3 minutes.", "Add beans, mushrooms and sour cream.", "Place in 1 1/2-quart casserole. Sprinkle with cheese and crumbs.", "Bake at 350\u00b0 for 30 minutes."]
["onion", "margarine", "flour", "water", "salt", "black pepper", "lemon juice", "green beans", "mushrooms", "sour cream", "Cheddar cheese", "bread crumbs"]