Remove the stem, seeds, and white pith from the bell peppers. Mince the onion.

Mix the ketchup and Worcestershire sauce in a container.

In a bowl, combine ground meat, minced onion, milk, breadcrumbs, salt, and black pepper. Mix until the mixture becomes sticky.

Lightly coat the inside of the bell peppers with flour. Stuff the meat mixture tightly into the peppers and slice them into 2cm thick rings.

Heat salad oil in a frying pan over medium heat. Cook the stuffed pepper rings until golden brown on both sides. Cover with a lid and cook on low heat for 3 minutes.