I daren't argue the authentic taco. I was born and raised in San Antonio, still here except for the few years I lived in Dallas. Some of the most exotic restaurants I've been to lately were owned by Honduran and Guatemalan immigrants. Rick Bayless did a whole show about how all cuisines are fusion. The corn in the taco is the new world element, but the pig in the pork filling was introduced by the Spaniards. In Tex-Mex it's beef filling. Cattle were brought to the new world by the Spaniards. My grandma made the best chili. I have the recipe but it's very time consuming. She said that like all German immigrants in south Texas, her mother learned how to make it from the Mexican locals. The book "Hidden Kitchens" has a chapter about the San Antonio "chile queens" who sold bowls of hot spiced meat chunks, bathed in chile sauce, from carts downtown, before they were chased away during the era of development and "gentrification". The "beans-are-not-chile" argument still has no weight for me though, having eaten vegetarian for so many years now. It's all good.