Taco Tuesday Guy looks suspiciously like the Series 2 Sombrero guy. Although the hat is a different color and and so is the poncho.
The Taco Tuesday guy comes with a platter and two 1x1 flats that are either suppose to look like taco's or blocks of cheese. They look like cheese to me. The blocks go on the tray loose, so watch out.
He's a pretty easy guy to feel for in the blind packs. The hat and tray or unique and there's really no other minifigure you could mistake this guy for.