I'm a big fan of these simple menus especially when it comes to food trucks. These guys do Greek sandwiches and not much else. The sandwiches are good, portions are very fair for the price, and service is pretty quick.
I usually go for one of the $1 additions you can make to any sandwich. I'm a fan of the Sloppy Twin (hummus and olives) but you can do the Hot Twin (Sriracha and Htipiti), the Smelly Twin (skordalia).You can sub out the tzatziki for lemon juice (Slim Twin) at no charge.