Rosted poblano sauce Recipe

I make most of the mexican dishes which you can prepare at home and could/should be vegetarians, every thursday is a mexican fiesta night in my house so i was thinking what to prepare this time. Last week i got nice poblano peppers from the farmer's market, i wanted to make chile rellenos, but it tasted good out of the oven and he was coming late that day so it was useless to make that. Anyway i roasted it on open flame and then i thought why not make green sauce instead of red for enchiladas.