I have found that best and most authentic Mexican restaurants are located in parts of town where nobody speaks English. Such as where my sister and her husband live in East Los Angeles.
Today (Sunday afternoon) we went to a very small family owned and run place that had incredibly delicious food. I needed my sister to translate the menu and convey my order, since my Spanish is rudimentary at best.
All the items were made from scratch using fresh ingredients. The chips were made fresh and were served hot. The salsa and pico de gallo were made right before your eyes. The cheese was melted and placed on your food at the table as well.
There is food, and then there is FOOD!