Rancho del Zocalo is a station service restaurant in Frontierland at Disneyland. You can do better.
It's not the Casa de Fritos anymore... :^) Rancho del Zocalo offers chicken, enchiladas, tacos, burritos and salads. There are tamales at Christmas time, too.
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Pretty good food, plenty of shady seating, and free refills on drinks. The cinnamon sugar fried tortillas they sell here are a delicious treat to take home.