Ketchup

Given my gluten intolerance I tend to shy away from a lot of mainstay restaurants. However, Ketchup's menu (which is overwhelmingly burger oriented) includes a number of great options for those avoiding gluten or red meat.

I had a turkey burger with a gluten free bun and gluten free fries. Delicious. I didn't try any of the house 'ketchups' (basically different flavored sauces) since the bottles weren't labelled as gluten free. Definitely one of the better places we ate while in National Harbor.