The bistek taco and the cochinita pibil taco at the Jarro taco trailer are transcendental. After the cook in the Jarro uniform passes your taco through the window, the real fun begins. On the stainless-steel counter that runs along the front of the trailer, there are assorted salsas and condiments in decorative Mexican three-legged bowls. There's a green salsa of chopped jalapeños and cilantro, a bright orange sauce made with hellishly hot chile de arbols and a neon lime-colored tomatillo and serrano slurry that will rip your tonsils out. If you're having a steak taco, you might try the dark chocolate-colored salsa made with dried chilies in oil and a dash of orange juice for sweetness. If you're eating cochinita pibil, don't miss the "Mayan escabeche," electric-purple onion slices marinated in lime juice, flecked with Mexican oregano and chili powder. The combination of flavors you select will define the taste of the taco, so you have to choose wisely.