I was into the Mercado Central at Lake Street and Bloomington Avenue on Friday. There are several fast food type booths there where you can get tacos, etc to go or to eat in their mall-esque eating area. Lo and behold, there is a Salvadoran place with a sign touting pupusas. Personally, I don't know that I'd go out of my way to have these ones again. I'd be interested in your opinion.
Several windows down, I ordered a taco carnitas and a one with beef tongue that were quite tasty. They came with an especially good red hot sauce. The presentation of those ordered to "eat in" was definately nicer that the to-go arrangement, if that matters to you.