A couple of months ago, there was a posting requesting suggesting for Washington Heights dining. Based upon a recommendation by a Salvadoran national, my girlfriend and I went to El Ranchito at 174th and Broadway this weekend. They speak limited English there, but with my limited Spanish, it was OK. I had a good, pungent horchata to start off with, my girlfriend got a drink called grenadilla or something like that -- it tasted like papaya mixed with something else. The pupusas were succulent, and the Salvadoran enchiladas (hard, unlike Mexican ones) were good, but the tacos should be avoided. We also got a dish with yuca and pork that wasn't out of this world, but tasty. For dessert (which we had to bring home because were we stuffed), we got a quezadilla -- yes, spelled with a "z" and not a Mexican pizza, but a cheesecake-kind-of thing that previous posters referred to also.
Overall, I'm glad I went there and it was very reasonably-priced, also.