Authentic. It’s a word that gets thrown around a lot but often without much merit. For most, the word evokes the idea of something pure or unadulterated. A letter of authenticity, for example, confirms something as not counterfeit. It’s genuine — a true representation of whatever it stands for.Which is why, when I call 2-month-old Agave Taco Bar an “authentic” Mexican restaurant, what I really mean is that chef-owner Ivan Alarcon is being true not just to his heritage but also to his craft.