Ingredients

1 pound ground pork

1 pound ground beef (85 percent lean)

1 cup fresh breadcrumbs

1/2 cup finely grated pecorino

1 1/2 teaspoons coarse salt

2 large eggs

1 clove garlic, minced

1/4 cup chopped fresh flat-leaf parsley

2 tablespoons extra-virgin olive oil

1/2 small onion, finely chopped

Pinch of red-pepper flakes

1 can (28 ounces) whole peeled tomatoes, pureed

4 leaves fresh basil (optional)

8 ounces fresh mozzarella, thinly sliced

Preparation

Using your hands, gently mix together pork, beef, breadcrumbs, pecorino, salt, eggs, garlic, and parsley in a large bowl. Form mixture into 2-inch balls.

Heat oil in a large ovenproof skillet over medium-high heat. Add meatballs; cook, turning, until browned all over, about 10 minutes. Use a slotted spoon to transfer to a plate.

Reduce heat to medium. Add onion and pepper flakes; cook, stirring occasionally, until onion is tender, about 4 minutes. Add tomatoes and basil; simmer, stirring frequently, until sauce is slightly thickened, about 8 minutes. Return meatballs and any juices to pan. Simmer, turning meatballs once, until cooked through, about 20 minutes.

Heat broiler. Arrange mozzarella on top of meatballs. Broil until melted, 2 to 3 minutes; serve.