Cut the onions in half horizontally. Scoop out the center and finely chop it for the meat filling. Lightly coat the inside of the onion halves with flour.

In a bowl, combine breadcrumbs and milk to moisten. Add ground pork, chopped onion, salt, and pepper. Mix until sticky. Stuff each onion half with 1/4 of the meat mixture, making 4 stuffed onions in total.

Heat olive oil in a frying pan over medium heat. Place the stuffed onions meat-side down and cook until browned. Flip them over, add the soup seasoning ingredients, cover, and simmer on low heat for 15 minutes.