Why is Federal Boulevard Denver's best stretch of asphalt for pumping up your spare tire? Because of joints like El Taco Veloz, where a meager $1.75 gets you a steaming corn tortilla abundantly mounted with whatever animal flesh rocks your world, plus onions and cilantro and access to the bar of Mexican condiments, a startling reservoir of grilled or pickled jalapenos and incendiary salsas (including an absolutely amazing avocado and tomatillo version), trays of pickled onions, carrots and chiles, and tubs of everything from cucumbers and radishes to slivered red onions and fat wedges of lime. Our favorite style of taco is the al pastor, spit-carved and topped with pineapple, and so popular that this particular meat has its own spindle in a special corner of the rollicking taqueria.