Homemade Hambagu
Finely chop the onion and set aside.
Mix ground beef, ground pork, chopped onion, bread crumbs, milk, egg, salt, and pepper thoroughly.
Shape the mixture into round patties.
Heat oil in a pan and cook the patties over medium heat, turning to cook both sides.
Once the patties are cooked, transfer them to a plate.
Add sauce ingredients to the pan, bring to a boil, then pour over the steaks.