Two tortillas make a street taco Corn tortillas can tear easily, especially once you add a little sauce or moisture to them. The extra tortilla is protection, like "grocery store double-bagging" as a Chowhound user put it. The second tortilla ensures your taco doesn't fall apart in your hand.
taqueríatah. - keh. - ree. - ah.ta. - ke. - ɾi. - a.ta. - que. - rí - a.