Boston Market's Macaroni And Cheese Recipe

• 4 ounce dry macaroni
• 1/2 stk butter
• 1/4 c. flour
• 1/4 tsp dry mustard
• 1 tsp salt
• 1 dsh freshly-grnd black pepper
• 2 c. lowfat milk
• 1 Tbsp. chopped onion
• 1 c. processed American cheese - (1/4 lb)

Directions