Directions

1. Preheat oven to 400°F. In a medium bowl combine tomatoes, tomato sauce, vinegar, brown sugar and mustard. Set aside.
2. In a large bowl combine onion, egg, breadcrumbs, 1 cup of the tomato mixture, and salt and pepper to taste. Add ground beef; mix well. In a shallow baking dish shape mixture into a 9x5x2-inch loaf.
3. Bake meatloaf 45 minutes. Drain fat. Spoon 1/2 cup of the remaining tomato mixture over the meatloaf. Bake 15 to 30 minutes more or until an instant-read thermometer registers 160°F. Let stand 5 minutes. Serve warm with remaining tomato sauce.