Here's what I found to be authentic Mexican food. When I was in Puerto Vallarta, each day I would get on the local bus and travel out to the farthest point it went then spend the day in that town. One day I was walking past the local school and all the kids came up to the fence yellow and green go gringo. A little farther down I came across a little place hamburguesa sign. I thought to myself well never had a hamburger in Mexico so I ordered one. To my surprise the lady walked out behind the counter across the street into the Carniceria across the street. She came back with a half pound of fresh ground hamburger and commence to cooking me one of the best hamburgers I ever had