2 cups uncooked elbow macaroni 1/4 cup margarine 1/4 cup flour 1/2 tsp salt 1/4 tsp pepper 1/4 tsp ground mustard (dry) 1/4 tsp Worcestershire sauce 2 cups milk 2 cups Velveeta processed cheese, cubed 1. Heat oven to 350 degrees. 2. Cook macaroni as directed on package. 3. While macaroni cooks, melt margarine in a 3 qt saucepan over low heat. Stir in flour, salt, pepper, mustard and Worcestershire sauce . Cook over low heat , stirring constantly, until mixture is smooth and bubbly, remove from heat. Stir in milk. Heat to boiling, stirring constantly. Boil and stir one minute. Stir in cheese. Cook, stirring occasionally until cheese is melted. 4. Drain macaroni. Gently stir macaroni into cheese sauce . Pour into ungreased 2 quart casserole dish. Bake uncovered 20-25 minutes or until bubbly.