Preheat oven to 375 degrees F (190 degrees C).
In a medium bowl combine the ground meat, egg, onion, ½ cup tomato sauce and cracker crumbs. Season with salt and pepper to taste and mix well; press mixture into a loaf pan and make a depression in the center. Set aside.
In a small bowl combine the remaining ½ cup tomato sauce, vinegar, mustard, brown sugar and water. Mix together until sugar has dissolved and pour liquid over meatloaf.
Bake in preheated oven for 1 hour.
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