There have been several posts here with threads discussing the definition of an "authentic" Taco.
IMO, this is the real deal:
2 Corn Tortillas,heated on a flat top grill. Filled with Meat, Poultry or Vegetable mixture.
Topped with chopped fresh Cilantro and Onions. Some type of Salsa or Pico de Gallo
either in the Taco, or on the side. NO MORE OR NO LESS!!