Preheat your oven to 350°F (175°C) and lightly grease a baking dish.

Sauté the chopped onion in olive oil until translucent, about 5 minutes; let cool.

In a large bowl, combine ground beef, sautéed onions, breadcrumbs, ½ cup ketchup, Worcestershire sauce, eggs, salt, and pepper. Mix until just combined.

Shape the mixture into a loaf in the greased baking dish; brush remaining ketchup on top.

Bake for about 1 hour or until internal temperature reaches 160°F (70°C). Let rest for 10 minutes before slicing.