They'll make you a shaken margarita using fresh mix and your choice of tequilas. Table salt on the rim - will remind you of being in Mexico.
The best things here are the chewy Cuban bread (try the Cuban or chicken sandwich), and the crispy fried plaintain chips (Mariquitas) with garlic oil. The Ropa Vieja is also very tasty!
You would never find this place on your own, and if you did, you'd lock your doors and keep driving. One of my favorite places for a slow drinking lunch in DFW. Try it - and be swept away to the island!