The slickest Austin Tacodeli to date opened downtown in late spring, in a massive office building at Third and Congress. But one step inside, you’ll find the same reassuring vibe and recipes you know from the other locations. Unique in the Texas taco-verse, the place created its own niche when it began in 1999. Its creations bridge the gap between Mexico’s street tacos in their pure form and mix-and-match American-style tacos. The Cowboy, for instance, caters to carnivores with chile-rubbed beef tenderloin, grilled corn, caramelized onions, and roasted peppers, topped with guacamole and queso fresco, while vegetarians are mollified by the Freakin’ Vegan, plump with organic refried black beans, avocado, and pico de gallo. True, the tortillas are commercially made, but judging by the mid-morning crowd (they open at 7 a.m., 8 weekends) that detail is not deterring many people, and it does keep prices down.