Rancho Viejo Restaurant at 12 Ellicott Street, Batavia, New York.

This is the best Mexican restaurant have visited. The food is good and seems to be authentic. They are always improving the atmosphere of the restaurant which is nice. I've found though that the waitresses, while kind, aren't always the most attentive and most times, it takes a while to be seated (even when it's not terribly busy) because there isn't anyone up front to seat you. All in all, it's a wonderful family friendly restaurant with good food, friendly staff, and a nice atmosphere.