Elevating the humble meatball to high art, the Meatball Shop serves up six varieties (including a vegetarian option). Order those balls on a long roll, add mozzarella and spicy tomato sauce, and voilà, you have a tasty, if happily downmarket, sandwich. (Or get them over pasta or sides.) This branch boasts a rock-and-roll vibe, with tattooed waitstaff and prominent beats.
There are five other branches in NYC. Check the website for details.