I've been going to Myanmar in Falls Church for a number of years and only recently discovered that there are several dishes available that are not on the menu.
One is a shrimp and beat spout salad that is different from the flavors you normally get with most of the salads, with a curry-like sauce.
A second is a goat curry with a deep and complex flavor.
You can also apparently get most dishes with the ubiquitous (in Burma anyway) shrimp paste ngapiya, which gives a little bit more of a homestyle flavor for those that have been to Burma.
Has anyone else discovered dishes not on the menu?