In a large bowl, combine ground beef, half of the tomato sauce (8 oz), raw oats, beaten eggs, chopped onions, salt, and pepper.

Mix the ingredients thoroughly until well combined.

Shape the mixture into a loaf shape.

Place the loaf in a shallow baking pan.

Cover the pan and chill in the refrigerator for 1 hour.

Preheat oven to 350°F (175°C).

Bake the meat loaf at 350°F for 1 hour.

Remove the meat loaf from the oven.

Pour the remaining tomato sauce (8 oz) over the top of the loaf.

Return the meat loaf to the oven and bake for an additional 20 minutes, or until the sauce is bubbly and the meat loaf is cooked through.