The versatility of the taco is a splendid thing. At any time in Kansas City, one can find tacos in KCK with cabeza (head) or lengua (tongue) inside, puffy tacos in the River Market, Choco Tacos on an ice-cream truck in Merriam, or pan-seared tuna tacos with jicama slaw and a pomegranate reduction downtown. Resourceful people on a budget have discovered Cancun Fiesta Fresh. On Tuesdays, the small Westport establishment serves up $1 ground-beef or chicken tacos all day and night. For another quarter each, tacos can be taken to go, leaving enough quarters for a Tecate and a lime.