Finely chop the onion.
Mix ground beef and pork, onion, breadcrumbs, egg, salt, and pepper together evenly.
Shape the mixture into round and flat patties.
Add oil to a pan and cook the steaks on both sides over medium-low heat.
Remove the steaks and sauté onion and butter in the pan.
Add water, Worcestershire sauce, and ketchup to make the sauce.
Pour the sauce over the steaks to finish.