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In a large bowl, combine the first eight ingredients. Crumble the pork and beef over the mixture and mix well.
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Cut the mozzarella into 18 1/2-inch cubes. Divide the meat mixture into 18 portions; shape each around a cheese cube.
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In a large skillet, cook the meatballs in oil in batches until no pink remains; drain.
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In a large saucepan, heat the marinara sauce; add the meatballs and heat through.
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Serve over pasta or as meatball sandwiches.