Macaroni And Cheese
["6 oz. elbow macaroni (1 1/2 c.)", "3 Tbsp. butter or margarine", "1/4 c. finely chopped onion", "2 Tbsp. all-purpose flour", "1/2 tsp. salt", "dash of pepper", "2 c. milk", "2 c. cubed American cheese", "1 medium tomato, sliced"]
["Cook macaroni according to package directions; drain.", "For cheese sauce, in a saucepan, melt butter or margarine.", "Cook onion in butter until tender, but not brown.", "Stir in the flour, salt and pepper.", "Add milk all at once; cook and stir until thickened and bubbly.", "Cook and stir 1 to 2 minutes more.", "Add cubed cheese; stir until melted."]
["elbow macaroni", "butter", "onion", "flour", "salt", "pepper", "milk", "American cheese", "tomato"]