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Put the hamburger, bread, eggs, onion, tomato sauce, salt and pepper into the bowl.
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Use your hands to mix and mash everything together. Continue until all of the ingredients are evenly distributed.
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Press this mixture into a 9 by 5-inch loaf pan, or another 2-quart size pan. Pack it tightly, by pounding on the surface a little with your hands, and smoothing it down so it's pretty on top.
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Bake at 350 ° for at least an hour. If the hamburger was cold from the fridge, cook it for 1-1/2 hours.
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Remove the meatloaf from the oven.
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Let it rest for a few minutes to firm up.