hit up a taco cart in downtown playa del carmen last week....honestly, one of the best food experiences of my life. And as luck would have it, there was federale food inspector there as I ordered....hilarious.
got 3 beef, 3 pork, 10 pesos a piece. They double layer the tortillas, then put the cilantro on, some salsa, and loaded with some sort of green hot sauce. Also tried a dark brown colored hot sauce which was apparently "piquante"? That hot sauce was off the chain. Can't find food like that in Canada