Meatball Marinara Sub

Ingredients

• 500g of ground beef
• one large egg
• 1/4 cup of breadcrumbs
• 1/4 cup of grated Parmesan
• two minced garlic cloves
• one teaspoon of salt
• 1/2 teaspoon of black pepper
• one teaspoon of dried oregano
• a bit of oil
• one tablespoon of olive oil
• one small finely chopped onion
• 800g of tomato passata
• a handful of chopped fresh basil
• salt and pepper to taste
• four tablespoons of softened unsalted butter
• two tablespoons of chopped fresh parsley
• a pinch of salt
• a baguette
• slices of mozzarella cheese
• extra grated Parmesan
• fresh basil leaves