True to the posts here, Zócalo in Arlington is just Ole with a new name. But this place is so phenomenal I just had to give it some more praise. We got there at around 8pm on Friday night and there was a 30-minute wait for a table for two. We sat on the bench and they brought us beer and chips and salsa while we waited. They have a whole menu just of chiles rellenos (which I don't remember them having before)-- and I ordered the chiles rellenos stuffed with chicken mole. Fantastic! My husband had the chicken mole burrito which he enjoyed immensely and which I enjoyed as lunch the next day. I don't think anyone in Boston makes better mole. When we left at 9:30 there were still people coming in for dinner.
They also own Andale on Summer Street in Boston.