It's all about the ambience, fajitas and margaritas at this famous Houston Tex-Mex institution. The restaurants are dark and homey, with inviting bars that exude that relaxing cantina feel. Start off with a serving of queso and chorizo and then order up a heaping plate of fajitas, piled high with strips of filet and lobster, with a decadent butter sauce on the side to go along with El Tiempo's famous red and green salsas. Then wash it all down with a potent margarita that'll make any drinker thankful he's 21 or older.