Prepare meatballs according to package directions., Meanwhile, place garlic in a small food processor; pulse until chopped. Add parsley, cilantro, salt and pepper; pulse until finely chopped. Add vinegar. While processing, gradually add oil in a steady stream., In a large bowl, toss meatballs with a little more than half of the chimichurri sauce. Transfer to a platter. Serve with remaining sauce for dipping.