Boil cabbage leaves for about 2 minutes in hot water with a pinch of salt, then transfer to cold water and drain excess water.

In a bowl, mix the ground meat, onion, egg, breadcrumbs, milk, salt, and black pepper thoroughly.

Place an appropriate amount of the meat mixture onto the cabbage leaf, wrap it, and shape it neatly.

Arrange the cabbage rolls in a pot and add chicken broth and tomato puree.