The family-owned and -operated Casa Orozco restaurants in the Tri-Valley are all about comfort food in a loud, fiesta atmosphere, and the menu includes all the Mexican standards: tacos, burritos, enchiladas, fajitas, tostadas, flautas, and chimichangas. Entrées, accompanied by rice and refried beans and smothered in cheese, are fresh and filling but not particularly innovative. That doesn't seem to dissuade loyal fans, who will wait hours-yes, hours-for a table on Friday and Saturday nights. Originally opened in 1986, the Livermore Casa Orozco was completely rebuilt in 2005 to meet demand. The new space resembles a hacienda, with a large dining room, bar, and shaded patio-opt for the latter on a warm afternoon with an appetizer of cool, house-made guacamole. Also in Dublin. Lunch and dinner daily.