2 cups (500 mL) uncooked elbow macaroni
1/4 cup (50 mL) butter or margarine
1/4 cup (50 mL) all-purpose flour
1/2 tsp (2 mL) salt
1/4 tsp (1 mL) pepper
1/4 tsp (1 mL) ground mustard
1/4 tsp (1 mL) Worcestershire sauce
2 cups (500 mL) milk
2 cups (500 mL) shredded Cheddar cheese