Add beef, pork, onion, garlic, egg and spices in a bowl. Mix well until everything blends together.

Form the meat mixture into four large patties. Press gently to keep the shape firm and even.

Place a skillet on medium heat. Add olive oil. Let the oil heat until warm and shiny.

Place patties in the skillet. Cook until brown on one side. Flip and cook the other side well.

Pour marinara sauce into a saucepan. Heat on low until warm. Stir sometimes to avoid burning.

Pour some warm sauce over the cooked patties. Let them simmer gently for better flavor.

Slice the rolls open. Place them on a baking tray. Toast lightly in the oven for crisp edges.

Place each patty on a toasted roll. Spoon more sauce on top for extra flavor and moisture.

Place provolone cheese slices on top of the patties. Cover well so it melts smoothly.

Place the sandwiches under the broiler. Heat until the cheese melts and turns golden.

Remove the sandwiches carefully. Add fresh parsley. Serve hot and enjoy every warm bite.