There is very good pupusa in Franklin Square at 996 Hempstead Tpke called Paco's Pupuseria(corner of Franklin Ave). I used to go there every week in lieu of expensive diner slop. Everything is good home-cooked food and the prices are very reasonable. The pupusas revuelta are sinful. I have also had pollo horneado and a chicken soup that would put any diner to shame. Paco recently remodeled it, but it's a casual place.