President Truman's Meatless Tuesday
- Preheat oven to 375 degrees. Lightly grease a 13x9x2 baking dish.
- Boil 6 cups salted water, add macaroni and cook until al dente. Drain.
- In a large saucepan, melt butter. Add onion and cook, stirring constantly, until tender. Add flour, salt, dry mustard, and paprika; mix well. Add milk and stir for 5 minutes, or until thickened. Add 2 cups shredded cheese and stir until melted. stir in macaroni and pour into prepared dish. Cover macaroni with tomato slices and sprinkle with remaining cheese. Bake for 45-50 minutes.