To prepare meatloaf, preheat oven to 350°. Lightly grease a 9- x 5-inch loaf pan.
Stir together beef, bell pepper, onion, eggs, oats,ketchup, and salt in a large bowl. Shape into a loaf, and place in pan.
Bake at 350° for 45 minutes. Meanwhile, make sauce.
To prepare sauce, melt butter in a large skillet over medium-high heat Add onion and bell pepper; cook 5 minutes or until vegetables are tender. Stir in ketchup and vinegar; simmer, stirring constantly, for 5 minutes or until sauce thickens slightly.
Remove loaf from oven and pour off pan juices. Spread half of sauce evenly over meatloaf; bake 25 more minutes.
Serve hot with remaining sauce.
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Notes
***From the kitchen of Barbara Ruth McGowan Lynchburg, TennesseeRecipe reprinted with permission from The Southern Living Community Cookbook by Sheri Castle, Oxmoor House 2014.