Mettaball recipe

#### Ingredients: - 1 pound ground beef (or a mix of beef and pork) - 1/2 cup breadcrumbs - 1/4 cup grated Parmesan cheese - 1/4 cup milk - 1 egg, lightly beaten - 3 cloves garlic, minced - 2 tablespoons chopped fresh parsley (or 1 tablespoon dried parsley) - 1 teaspoon dried oregano - 1/2 teaspoon salt - 1/4 teaspoon black pepper - 1/4 cup finely chopped onion - 1 tablespoon olive oil (for frying) - 2 cups marinara sauce (store-bought or homemade)