Iron Cactus is a Mexican grill and margarita bar with a gluten free menu (they call it a "gluten free-ish"menu since there are shared preparation areas and cross contamination is likely to occur. The fryers are shared with gluten containing items and the possibility for food items to come in contact with each other is high. Their gluten free menu can be viewed here: http://ironcactus.com/dallas/gluten-free-menu
They have a wide variety of gluten free options, ranging from appetizers, salads, enchiladas, and tacos. They also have two dessert options: vanilla bean flan and mexican chocolate mousse.
Since they are unable to guarantee that any item can be completely free of gluten, those with Celiac Disease or serious sensitivity to gluten should be cautious.