Diners reveal the best restaurant meatball subs, from classic chains like Firehouse Subs to beloved local spots known for tender meatballs, rich marinara, and melty cheese.

Tell someone you want a sub sandwich, and it's generally accepted that you want a sandwich served on a long roll or baguette. Say you want a po' boy, hoagie, banh mi, grinder, hero, spuckie, cubano, ...