Pupusas are said to have their origin hundreds of years ago in El Salvador. We first tried them in Honduras when we lived there from 1997 to 1999. Our first ones there were bought and eaten in the stadium market. The little stands there all cooked them on flat pans called a comal and they all used kerosene as their heat source. We still think that pupusas are most authentic when they have a slight kerosene flavor! We’ve also found pupusas in Dallas, TX and surely wherever there are Salvadoran or Honduran populations, you’ll probably find at least one “pupuseria” (pupusa restaurant).
Just a bit of cultural flavor FYI.
Enjoy! or rather ¡Buen Provecho!