Pork pupusas take me back to my childhood vacations in el salvador. We would visit my grandmother every year and we would always enjoy going to the traditional pupusa shops. I dont remember having pupusas with any sauce other than the ever-present pickled cabbage, but nowadays, the sauce made from tomatoes is found in all of the pupusa plates. For this recipe, i prepared an exquisite and spicy natural yogurt sauce with chipotles in adobo. This is a different, but equally delicious flavor for a traditional dish.