Tuna Macaroni

1 2/3 cups uncooked macaroni
2 quarts water
1 teaspoon salt
2 tablespoons butter
2 tablespoons all-purpose flour
1/2 teaspoon dry mustard
1 teaspoon salt
1 teaspoon Worcestershire sauce
1/4 teaspoon ground black pepper
2 cups milk
1 (7-ounce) can chunk tuna
1/2 cup chopped onion
1 tomato, seeded and chopped
2 cups shredded cheddar cheese

Preparation:

Preheat oven to 325°F.

Cook macaroni per package directions. Drain and set aside.
In a saucepan, combine butter, flour, dry mustard, salt, Worcestershire sauce, pepper, milk, tuna, and chopped onion. Heat through on medium heat; mix in the cooked macaroni and pour half the mixture into a 13 x 9-inch casserole dish.

Spread half of tomato on the macaroni mixture with half of the cheddar cheese. Pour on the remaining macaroni and top with the remaining tomato and shredded cheddar cheese.
Bake 15 to 20 minutes, or heated through.